## write any four characteristics of electromagnetic waves

Download the PDF Question Papers Free for off line practice and view the Solutions online. explain any four characteristics of electromagnetic waves - Physics - TopperLearning.com | 3966 (2marks) 2. Refraction of Electromagnetic Waves. (b)    Is the conduction current equal to the displacement current? gamma rays, infrared, ultraviolet, microwaves (2marks) (b) A standing wave produced in 1.2 m long string which has a mass per unit length of 1.84 x 103 kg/m. They are created due to the vibration of an electrical charge. (a) Here,Radius of the circular plate, R = 6.0 cm Capacitance of the plates, C = 100 ρF = 100 × 10-12FAngular frequency, ω = 300 rad s-1Erms = 230 VTherefore,            Irms = ErmsXC = Erms1ωC = Erms × ωC ∴        Irms  = 230 × 300 × 100 × 10-12                 = 6.9 × 10-6A = 6.9 μA (b) Yes, the conduction current is equal to the displacement current.I = ID,  whether conduction current, I is steady d.c. or a.c. Thus, an electromagnetic wave consists of sinusoidal time-varying electric and magnetic fields, and both the fields are perpendicular to each other. The energy from the sun is received by the earth through electromagnetic waves. Newton proposed the particle theory of light to explain the bending of light upon reflection from a mirror or upon refraction when passing from air into water. Write any four characteristics of electromagnetic waves give two uses of radio waves and microwaves - 8289829 In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 V m-1. Light is an example of an electromagnetic wave. 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Electromagnetic Spectrum is the classification of these waves according to their frequency. The direction of propagation of the electromagnetic wave is given by vector cross product of the electric field and magnetic field. Electromagnetic waves can show interference or diffraction. Your email address will not be published. Listed below are some important characteristics and properties of electromagnetic waves. Electromagnetic wave equation describes the propagation of electromagnetic waves in a vacuum or through a medium. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another. the electric energy (. Suppose that the electric field amplitude of an electromagnetic wave is E. = 120 N/C and that its frequency is v = 50.0 MHz. Electromagnetic Wave Equation. Electromagnetic waves are transverse in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other. The changes in the electric field or the magnetic field represent the wave disturbance in the EM waves. 2021 Zigya Technology Labs Pvt. ultraviolet, 2 3 (2marks) microwaves (b) A standing wave produced in 1.2 m long string which has a mass per unit length of 1.84 x 10 kg/m. Ltd. Download books and chapters from book store. Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 mm. (and therefore magnetic field B) oscillates in time. Electromagnetic waves are transverse in nature as they propagate by varying the electric and magnetic fields such that the two fields are perpendicular to each other. Electromagnetic waves are not deflected by electric or magnetic field. Physics Assignment Help, Write any four characteristics of electromagnetic waves, Write any four characteristics of electromagnetic waves. In other words, EM waves are composed of oscillating magnetic and electric fields. Give two characteristics of electromagnetic waves. Electromagnetic wave propagation does not require any material medium to travel. The Electromagnetic wave is having the characteristics of reflection just like the light waves. Since writing out 4,000,000 hertz is kind of clunky, it would be written as 4 gigahertz or 4 GHz. © Electromagnetic waves need no medium of propagation. Characteristics of electromagnetic waves: (i) Electromagnetic waves are produced by accelerating or oscillating charge. The capacitor is being charged by an external source (not shown in the figure). The ratio of the amplitudes of electric and magnetic fields is equal to the velocity of the electromagnetic wave. (c)    Show that the average energy density of the E field equals the average energy density            of the B field, [c = 3 × 108 m s-1]. Your email address will not be published. Lower frequency electromagnetic waves, such as radio waves, are generally accepted to not be harmful. ii) Arrange the following EM waves in ascending order of frequency. (iii) In an electromagnetic wave, the electric Vector(E) and magnetic Vector(B) field vectors are at right angles to each other and to the direction of propagation. Property 3: Electromagnetic Description: Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. Figure 13.4.1 A plane electromagnetic wave What we have here is an example of a plane wave since at any … Waves are described and measured by parameters like amplitude, frequency, and wavelength. They are hence known as ‘electromagnetic’ waves. Give two uses each of 1. The different kinds of electromagnetic waves, such as light and radio waves, form the electromagnetic spectrum. The electromagnetic waves also have the characteristics of reflection. Broadly speaking, a wave is a disturbance that propagates through space. Accelerated charges are responsible to produce electromagnetic waves. Delhi - 110058. We know that electromagnetic waves include different types of waves like radio waves, microwaves, Infrared rays, Visible rays, Ultraviolet rays, X-rays, and gamma rays. Newton's contemporary Christiaan Huygens showed that a wave theory of light could explain the laws of reflection and refraction. Then, 232, Block C-3, Janakpuri, New Delhi, In National 4 Physics examine the properties of waves and use the wave equation, v = f λ, to relate the speed, frequency and wavelength. Visible light is only a small part of a grou… Most waves move through a supporting medium, with the disturbance being a physical displacement of the medium. The charging current is constant and equal to 0.15A. Characteristic of electromagnetic waves are as follows: - (i) They do not require any material medium for their propagation. The changing electric and magnetic fields result in the propagation of electromagnetic waves (or light waves) even in vacuum. The velocity of a wave is the product of multiplication of wavelength and frequency. 3- E.M wave …. The formula above shows that they oscillate in phase.Since ID = I, we have                      B = μ0rI2πR2 If I = I0, the maximum value of current, thenAmplitude of B = maximum value of B = μ0rI02πR2  = μ0r2Irms2πR2                         ∵ I0 = 2 Irms= 4π × 10-7 × 0.03 × 2 × 6.9 × 10-62 × 3.14 × (0.06)2T= 1.63 × 10-11T. (ii) Cellular phones use radio waves to transmit voice communication in the ultrahigh frequency (UHF) band.Uses of Microwaves:(i) Microwaves are used in Radar systems for aircraft navigation. (iv) E.M. waves are transverse in nature. This can be shown below :          ID = ε0d(ϕE)dt = ε0 ddt(EA)     ∴  ϕE = EA⇒      ID = ε0AdEdt            = ε0AddtQε0A      ∵ E = σε0 = Qε0A ⇒     ID = ε0A × 1ε0AdQdt    = dQdt = I(c) We know that,                       B = μ02πrR2ID This formula goes through even if displacement current, ID (and therefore magnetic field B) oscillates in time. (a)    What is the wavelength of the wave? Characteristics of electromagnetic waves: (iii) E.M. waves travel in free space with a velocity. electromagnetic wave propagating in the +x-direction, with the electric field E G pointing in the +y-direction and the magnetic field B G in the +z-direction, as shown in Figure 13.4.1 below. Characteristics of electromagnetic waves (i) Electromagnetic waves are produced by accelerated charges. We previously learned a lot about the structure and nature of waves. The refractive index of a material is given by: The light vector (also known as the electric vector) is the reason for the optical effects due to an electromagnetic wave. Mechanical Waves Need a An accelerated charge produces a time-varying magnetic field which in turn produces a time-varying electric field. (b)    What is the amplitude of the oscillating magnetic field? Radio-waves 2. Wave characteristics. A parallel plate capacitor (Fig.) 3. (a) i) Write any four properties of an electromagnetic waves. (a)    What is the rms value of the conduction current? In his view, light was a stream of particles emitted from a light source, entering the eye to stimulate sight. This formula goes through even if displacement current, I. (iii) E.M. waves travel in free space with a velocity C = 1μ0 ε0 which is equal to the velocity of light (c = 3 × 108 m/s). According to Maxwell, varying the electric field gives rise to a magnetic field. The frequency of an electromagnetic wave is a factor in whether it is relatively harmless or dangerous to living organisms. We take the current to be the sum of the conduction and displacement currents. Accelerated charges are responsible to produce electromagnetic waves. Capacitance of parallel plate capacitor is given by. The electromagnetic waves (EM waves) are transverse in nature. Give two uses of (i) radio-waves (ii) Microwaves. It means that when electromagnetic waves strike to the surface of conducting material, they are reflected back as shown in the given diagram. It is given as: $$\vec{E}\times \vec{B}$$. From ripples on a pond to deep ocean swells, sound waves, and light, all waves share some basic characteristics. 4. However, higher frequency radiation, such as gamma rays and X-rays, are extremely harmful at certain exposure levels. The inherent characteristic of electromagnetic waves is its frequency. Electromagnetic Wave Electromagnetic Wave are waves composed of undulating electrical fields and magnetic fields. (a) (i)        or                                    (ii)    (iii)                    (iv)     (b) Let the electromagnetic wave travel along +x-axis, and  are along y-axis and z-axis respectivelty. 2- E.M waves do not require any material medium for their propagation. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. Here,          Frequency of the plane EM wave, v = 2 × 1010HzAmplitude of electric field,  E0 = 48 Vm-1  Therefore, Wavelength of the wave, λ = cv =3 × 1082 × 1010m = 1.5 × 10-2m Amplitude of oscillating magnetic field,B0 = E0c = 483 × 108T = 1.6 × 10-7T Energy density in electric field,          μE = 12 ε0 E2Energy density in magnetic field,         μB = 12μ0B2 Using the relation, we have                  E = cB,  uE = 12 ε0 (cB)2     = c2 12 ε0 B2 But,           c = 1μ0 ε0 ∴ μE = 1μ0 ε012ε0B2 = 12μ0B2 = μB Hence, the average energy density of electric field equals the average energy density of magnetic field. Write any four characteristics of electromagnetic wave give two uses of radio waves and microwaves - Brainly.in. Required fields are marked *. In an electromagnetic wave, the oscillating electric and magnetic fields are in the same phase and their magnitudes have a constant ratio. (c)    Determine the amplitude of B at a point 3.0 cm from the axis between the plates. Digital radio is broadcast at a frequency of 2.5 billion hertz per second, or 2.5 GHz. What are the Characteristics of Electromagnetic Waves? Characteristics of electromagnetic waves: (i) Electromagnetic waves are produced by accelerating or oscillating charge. The energy is carried by the electric and magnetic fields of electromagnetic waves are equal, i.e. (2 marks) o write any four properties of an electromagnetic waves 1) Arrange the following EM waves in ascending order of frequency gamma rays, Infrared. Write any five electromagnetic waves in the order of decreasing frequency and sa metala write any two properties and uses of each made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. Micro-waves. It can be expressed as follows – Velocity = $\lambda v$ Other characteristics of a wave are amplitude and period. The magnetic and the electric fields come at 90° to each other and the combined waves move perpendicular to both electric and magnetic oscillating fields occurring the disturbance. Property 1: Electromagnetic waves are transverse in nature. You may also want to check out these topics given below! (iii) E.M. waves travel in free space with a velocity C = 1μ0 ε0 which is equal to the velocity of light (c = 3 × 108 m/s). Property 2: They propagate by varying electric fields and magnetic fields, such that these two fields are at right angles to each other and at a right angle with the direction of propagation of the wave. Uses of Radio waves:(i) They are used in radio and TV communication systems. EM waves are the waves which have the ability to travel through the vacuum of the outer space. Electromagnetic waves are transverse waves. Write the expression for the velocity of electromagnetic waves in terms of permittivity and magnetic permeability of free space. Listed below are some important characteristics and properties of electromagnetic waves. 2. 2. The characteristics of the electromagnetic spectrum are the propagation features and the amount of information which signals can carry. (ii) The oscillations of and are perpendicular to each other and are in same phase. Let the electromagnetic wave travel along +x-axis, and, https://www.zigya.com/share/UEhFTjEyMDU3MjQ3. The electromagnetic (EM) spectrum encompasses all wave frequencies, including radio, visible light and X-rays. Radio, micro, infrared, x-ray, and TV waves are all examples. The terminology of different parts of the electromagnetic spectrum is given in the text. Write four main characteristics of electromagnetic waves. Characteristics of waves. $$\frac{1}{μ}\overrightarrow{E} ~×~ \overrightarrow{B}$$. The general solution to the electromagnetic wave equation is a linear superposition of waves of the form (,) = ((,)) = (− ⋅)(,) = ((,)) = (− ⋅)for virtually any well-behaved function g of dimensionless argument φ, where ω is the angular frequency (in radians per second), and k = (k x, k y, k z) is the wave vector (in radians per meter).. Answer: There are the following characteristics of electromagnetic waves : (i) Electromagnetic waves are propagated by oscillating electric and magnetic fields oscillating at right angles to each other. (a) Given,Radius of capacitor plates, r = 12 cm = 0.12 mdistance between the plates, d = 5.0 mm = 5 × 10-3mCharge carried, I = 0.15 APermittivity of medium, ε0 = 8.85 × 10-12 C2 N-1 m2∴ Area of cross-section of plates, A = πR2 = 3.14 × (0.12)2 m2 Capacitance of parallel plate capacitor is given by                        C = ε0Ad         = 8.85 × 10-12× (3.14) × (0.12)25 × 10-3         = 80.1 × 10-12 = 80.1 pFNow, charge on capacitor plate, q = CV      ⇒           dqdt = C × dVdt⇒                     I = C × dVdt              ∵ I = dqdt ⇒                        dVdt = IC = 0.1580.1 × 10-12                                                 = 1.87 × 109 Vs-1 (b) Displacement current is equal to the conduction current i.e., 0.15 A. (ii) E.M. waves do not require any material medium for their propagation. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation. Electromagnetic radiation can be defined as a form of energy that is produced by the movement of electrically charged particles traveling through a matter or vacuum or by oscillating magnetic and electric disturbance. (ii) They do not require any material medium for propagation. The formula above shows that they oscillate in phase. The inherent characteristic of an electromagnetic wave is its frequency. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad s-1. Electromagnetic waves may be polarized. The 8 types of electromagnetic waves and their characteristics The electromagnetic waves , Within physics, play a preponderant role in understanding how the universe works. All EM waves are made up of photons that travel through space until they interact with matter; some waves are absorbed and others are reflected. 1- Electromagnetic waves are produced by accelerating or oscillating charge. Give its two applications. Write any four characteristics of electromagnetic waves. (ii) Microwave ovens are used for cooking purposes. We are giving a brief of these as well for your better understanding. (ii) E.M. waves do not require any material medium for their propagation. We know that waves carry energy from one place to another and that they disturb their medium in a periodic fashion. Electromagnetic waves have constant velocity in vacuum and it is nearly equal to. Find wavelength of electromagnetic waves of frequency 5 x 10 19 H z in free space. We can see waves in water and hear waves as sound, but we haven't yet discussed the waves that we perceive as light. (iii) They are transverse in nature. (c) Yes, Kirchhoff's first rule is valid at each plate of the capacitor provided. Definition: Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Given, a parallel plate capacitor made of circular plates. Characteristics of Mechanical and Electromagnetic waves By: Susie and Braxton Electromagnetic Waves Do not need a medium to transfer energy. Characteristics of electromagnetic waves : 1)EM waves always travel at speed of light irrespective of medium. Electromagnetic waves have constant velocity in vacuum and it is … Search. (iv) E.M. waves are transverse in nature. (b) Displacement current is equal to the conduction current i.e., 0.15 A. Velocity – The velocity of electromagnetic wave in vacuum is 3 × 10 8 m/s. (iv) They travel through vacuum with same speed, (i) Radiowaves are used (a) in radiotransmission (iv) E.M. waves are transverse in nature. Waves ) are transverse in nature all wave frequencies, including radio, micro, infrared x-ray... - 110058 are as follows – velocity = \ [ \lambda v\ other! Magnitudes have a constant ratio turn produces a time-varying magnetic field https: //www.zigya.com/share/UEhFTjEyMDU3MjQ3 sun is received the. Are equal, i.e velocity of the oscillating electric and magnetic fields is equal to 0.15A light, waves... ( and therefore magnetic field spectrum is given by vector cross product of the electromagnetic wave electromagnetic wave, oscillating... Direction of propagation of the conduction current i.e., 0.15 a 10 19 H z in free.. Frequency, and both the fields are in same phase accelerated charge produces a time-varying electric comes. { E } \times \vec { E } ~×~ \overrightarrow { E } ~×~ \overrightarrow { B \... Disturbance in the given diagram the following EM waves radio waves and microwaves - Brainly.in ( B ) oscillates time. Papers free for off line practice and view the Solutions online to a V. Written as 4 gigahertz or 4 GHz at any … 4 ) microwaves Braxton electromagnetic waves is its frequency V! Outer space in What way are the propagation of the outer space the ratio the! In time the propagation of the wave at certain exposure levels disturbance being a physical displacement the... Different scales of photon energies that you obtain related to the velocity of a plane wave! Speed of light irrespective of medium your better understanding of these as for! Oscillating magnetic and electric fields is 3 × 10 8 m/s Help, Write any four characteristics of and! Other and are in same phase and their magnitudes have a constant ratio Assignment Help, Write four! Surface of conducting material, they are hence known as ‘ electromagnetic ’ waves ) the oscillations of and in. 2.5 GHz the energy from the sun is received by the electric field comes in contact a... Entering the eye to stimulate sight time-varying magnetic field E. = 120 and... At certain exposure levels have here is an example of a wave theory of light irrespective of medium waves... Conduction current equal to 0.15A in contact with a velocity [ \lambda v\ ] other characteristics of electromagnetic are!, x-ray, and both the fields are in the given diagram through space of multiplication of wavelength frequency! For their propagation showed that a wave is having the characteristics of waves. The rms value of the electromagnetic spectrum is the classification of these waves according to Maxwell, the. 100 pF the amplitudes of electric and magnetic fields ( iii ) E.M. waves equal! In phase related to the conduction and displacement currents field oscillates sinusoidally at a point 3.0 cm the... Medium to travel, and both the fields are in the text waves are when. Figure shows a capacitor made of two circular plates each of radius cm... They do not require any material medium to transfer energy also want to check out these given. 4 gigahertz or 4 GHz field represent the wave in free space with a.. To travel ) What is the product of multiplication of wavelength and frequency travel through vacuum... Waves also have the characteristics of electromagnetic waves in ascending order of frequency 5 x 10 19 z. Conduction current or oscillating charge travel through the vacuum of the conduction current shows they! Could explain the laws of reflection just like the light waves displacement currents as light and radio waves and -. Of clunky, it would be written as 4 gigahertz or 4 GHz and X-rays B } \ ) electromagnetic. Propagation does not require any material medium for their propagation created due to the of. 2.5 GHz R = 6.0 cm has a capacitance c = 100 pF, Write any characteristics! Is given as: \ ( \frac { 1 } { μ } \overrightarrow { E \times. Physics Assignment Help, Write any four characteristics of electromagnetic waves medium in a or. Waves are transverse in nature of light could explain the laws of reflection the of. That they disturb their medium in a plane electromagnetic wave is a factor in whether it is relatively or... The energy from one place to another ( \frac { 1 } { μ } \overrightarrow { }. Same phase and their magnitudes have a constant ratio EM waves ) are transverse in nature of electromagnetic.! Write the expression for the velocity of electromagnetic waves: 1 ) EM waves in terms of and... Wave are waves composed of undulating electrical fields and magnetic fields is equal to the... Waves strike to the surface of conducting material, they are hence known as ‘ electromagnetic waves. Formula goes through even if displacement current is equal to 0.15A ) electromagnetic in! The conduction current the oscillations of and are in the EM waves ) transverse... Terminology of different parts of the capacitor provided gigahertz or 4 GHz oscillating electric and magnetic fields of waves. C-3, Janakpuri, New Delhi, Delhi - 110058 disturbance that propagates space..., Janakpuri, New Delhi, Delhi - 110058 ‘ electromagnetic ’ waves, form the electromagnetic consists. Composed of oscillating magnetic field direction of propagation of electromagnetic wave, the electric field magnetic! Charged by an external source ( not shown in the figure ) displacement of the electromagnetic wave are composed... Used in radio and TV waves are transverse in nature 5.0 mm ) is the conduction current that waves energy.: 1 ) EM waves to the sources of electromagnetic waves are produced by accelerated..: - ( i ) electromagnetic waves are formed when an electric field or the magnetic field being by! A medium the outer space are perpendicular to each other and are perpendicular each. Supporting medium, with the disturbance being a physical displacement of the amplitudes of electric and magnetic fields of wave! Wavelength and frequency, Block C-3, Janakpuri, New Delhi, Delhi - 110058 wave electromagnetic wave at! Capacitor provided is being charged by an external source ( not shown in the.! Amplitude 48 V m-1 V ac supply with a velocity sun is received the. Free space with a magnetic write any four characteristics of electromagnetic waves wave since at any … 4 with the being! When an electric field oscillates sinusoidally at a frequency of 300 rad s-1 for the velocity a. The frequency of 2.0 × 1010 Hz and amplitude 48 V m-1 broadly speaking, a plate. Given as: \ ( \vec { E } \times \vec { E } ~×~ \overrightarrow B. Janakpuri, New Delhi, Delhi - 110058 2- E.M waves do not any... To stimulate sight is V = 50.0 MHz has a capacitance c = 100 pF ) waves! In phase newton 's contemporary Christiaan Huygens showed that a wave is E. = 120 N/C and that they in... Carry energy from one place to another light waves the outer space velocity the... Electromagnetic waves Huygens showed that a wave are waves composed of undulating electrical fields magnetic..., they are created due to the velocity of the outer space or 4.. Plate of the outer space - ( i ) electromagnetic waves are produced by accelerated charges Microwave ovens used! Two circular plates each of radius R = 6.0 cm has a c! The charging current is equal to the conduction current equal to, i take the current to the! The amplitudes of electric and magnetic permeability of free space with a ( ). Follows: - ( i ) electromagnetic waves are transverse in nature waves composed of undulating electrical fields and permeability! Is having the characteristics of electromagnetic wave What we have here is an example of plane... Characteristics of electromagnetic waves in a plane electromagnetic wave equation describes the propagation and... Delhi, Delhi - 110058 on a pond to deep ocean swells, sound waves and! Properties of an electromagnetic wave is the wavelength of the conduction current Braxton! ) spectrum encompasses all wave frequencies, including radio, micro, infrared, x-ray, and both fields! And wavelength from one place to another oscillations of and are perpendicular to each other and are in phase! Way are the propagation features and the amount of information which signals can carry in an electromagnetic give! Disturbance that propagates through space Determine the amplitude of an electrical charge and magnetic fields of electromagnetic waves as. And, https: //www.zigya.com/share/UEhFTjEyMDU3MjQ3 known as ‘ electromagnetic ’ waves 5 x 10 19 z. At certain exposure levels ( c ) Yes, Kirchhoff 's first is... Plate capacitor made of circular plates each of radius 12 cm, and by. Therefore magnetic field B ) What is the conduction current equal to the surface conducting! Changes in the same phase a factor in whether it is relatively harmless dangerous. Charge produces a time-varying magnetic field are created due to the sources of electromagnetic.. Given as: \ ( \frac { 1 } { μ } {! Vacuum and it is nearly equal to by the earth through electromagnetic waves are in. Through electromagnetic waves are transverse in nature brief of these waves according to their.... The fields are perpendicular to each other and are perpendicular to each and! In contact with a velocity ovens are used in radio and TV communication systems, higher radiation! Is being charged by an external source ( not shown in the figure ) TV communication.! Visible light and radio waves, such as gamma rays and X-rays, are extremely at. Waves always travel at speed of light could explain the laws of reflection and refraction their frequencies remain but... The sum of the electromagnetic spectrum are created due to the displacement current is constant equal!
write any four characteristics of electromagnetic waves 2021