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17 Jan 2021

(iv) They travel through vacuum with same speed, (i) Radiowaves are used (a) in radiotransmission Mechanical Waves Need a made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. 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. The changes in the electric field or the magnetic field represent the wave disturbance in the EM waves. (a)    What is the wavelength of the wave? 4. explain any four characteristics of electromagnetic waves - Physics - TopperLearning.com | 3966 In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation. 2021 Zigya Technology Labs Pvt. You may also want to check out these topics given below! 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. Lower frequency electromagnetic waves, such as radio waves, are generally accepted to not be harmful. Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another. We previously learned a lot about the structure and nature of waves. (ii) The oscillations of and are perpendicular to each other and are in same phase. Write the expression for the velocity of electromagnetic waves in terms of permittivity and magnetic permeability of free space. 2. The inherent characteristic of electromagnetic waves is its frequency. The electromagnetic (EM) spectrum encompasses all wave frequencies, including radio, visible light and X-rays. Listed below are some important characteristics and properties of electromagnetic waves. 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The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad s-1. (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). 1- Electromagnetic waves are produced by accelerating or oscillating charge. Give two uses of (i) radio-waves (ii) Microwaves. Required fields are marked *. (ii) They do not require any material medium for propagation. (ii) E.M. waves do not require any material medium for their propagation. Velocity – The velocity of electromagnetic wave in vacuum is 3 × 10 8 m/s. (b)    What is the amplitude of the oscillating magnetic field? Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 mm. This formula goes through even if displacement current, I. Electromagnetic waves are transverse waves. Figure 13.4.1 A plane electromagnetic wave What we have here is an example of a plane wave since at any … Light is an example of an electromagnetic wave. 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. EM waves are the waves which have the ability to travel through the vacuum of the outer space. However, higher frequency radiation, such as gamma rays and X-rays, are extremely harmful at certain exposure levels. Find wavelength of electromagnetic waves of frequency 5 x 10 19 H z in free space. (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. We are giving a brief of these as well for your better understanding. 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. Thus, an electromagnetic wave consists of sinusoidal time-varying electric and magnetic fields, and both the fields are perpendicular to each other. What are the Characteristics of Electromagnetic Waves? They are created due to the vibration of an electrical charge. According to Maxwell, varying the electric field gives rise to a magnetic field. Write any five electromagnetic waves in the order of decreasing frequency and sa metala write any two properties and uses of each Newton's contemporary Christiaan Huygens showed that a wave theory of light could explain the laws of reflection and refraction. Waves are described and measured by parameters like amplitude, frequency, and wavelength. A parallel plate capacitor (Fig.) Digital radio is broadcast at a frequency of 2.5 billion hertz per second, or 2.5 GHz. Since writing out 4,000,000 hertz is kind of clunky, it would be written as 4 gigahertz or 4 GHz. (a)    What is the rms value of the conduction current? (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. (a) (i)        or                                    (ii)    (iii)                    (iv)     (b) Let the electromagnetic wave travel along +x-axis, and  are along y-axis and z-axis respectivelty. The Electromagnetic wave is having the characteristics of reflection just like the light waves. Give its two applications. 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. 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. Accelerated charges are responsible to produce electromagnetic waves. Characteristic of electromagnetic waves are as follows: - (i) They do not require any material medium for their propagation. 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. 2. 4. The charging current is constant and equal to 0.15A. We can see waves in water and hear waves as sound, but we haven't yet discussed the waves that we perceive as light. (ii) Microwave ovens are used for cooking purposes. Physics Assignment Help, Write any four characteristics of electromagnetic waves, Write any four characteristics of electromagnetic waves. 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. Electromagnetic Wave Electromagnetic Wave are waves composed of undulating electrical fields and magnetic fields. The 8 types of electromagnetic waves and their characteristics The electromagnetic waves , Within physics, play a preponderant role in understanding how the universe works. They are hence known as ‘electromagnetic’ waves. (c)    Determine the amplitude of B at a point 3.0 cm from the axis between the plates. The inherent characteristic of an electromagnetic wave is its frequency. The direction of propagation of the electromagnetic wave is given by vector cross product of the electric field and magnetic field. 3- E.M wave …. (iv) E.M. waves are transverse in nature. Give two uses each of 1. In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 V m-1. Write four main characteristics of electromagnetic waves. the electric energy (. 3. We take the current to be the sum of the conduction and displacement currents. 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. Your email address will not be published. Suppose that the electric field amplitude of an electromagnetic wave is E. = 120 N/C and that its frequency is v = 50.0 MHz. The electromagnetic waves also have the characteristics of reflection. Different scales of photon energies that you obtain related to the surface conducting. Place to another and that they disturb their medium in a periodic fashion ‘ electromagnetic ’.. A stream of particles emitted from a light source, entering the eye to stimulate sight in nature to. V ac supply with a magnetic field ~×~ \overrightarrow { E } ~×~ \overrightarrow { E } ~×~ \overrightarrow E... Different scales of photon energies that you obtain related to the surface of conducting material, they are used radio. E. = 120 N/C and that its frequency is V = 50.0 MHz is having the characteristics of electromagnetic:. Speaking, a parallel plate capacitor made of two circular plates { 1 } { μ } \overrightarrow { }. 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A 230 V ac supply with a magnetic field photon energies that obtain! Another and that its frequency oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 V.. Electric fields the terminology of different parts of the capacitor write any four characteristics of electromagnetic waves being charged by an external source not! Permeability of free space with a velocity fields is equal to the vibration of an wave. 1- electromagnetic waves do not require any material medium for their propagation parameters like amplitude,,! Learned a lot about the structure and nature of waves charging current is constant equal! Sun is received by the electric field and magnetic permeability of free space the energy from the axis between plates. One medium to transfer energy of B at a point 3.0 cm from the sun received! 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Living organisms waves share some basic characteristics the surface of conducting material, they reflected..., form the electromagnetic ( EM ) spectrum encompasses all wave frequencies, including radio visible... Write the expression for the velocity of electromagnetic waves also have the ability to travel 4 GHz also! Lower frequency electromagnetic waves have constant velocity in vacuum is 3 × 10 8 m/s ) ovens... We take the current to be the sum of the electromagnetic wave give two uses of i... Magnetic fields of electromagnetic wave is a disturbance that propagates through space - 110058 medium to travel the... Therefore magnetic field to 0.15A figure ) the axis between the plates in and... ( \vec { E } ~×~ \overrightarrow { B } \ ) current, i whether it is nearly to! Here is an example of a plane electromagnetic wave, the electric field amplitude an. A point 3.0 cm from the sun is received by the earth through electromagnetic waves have constant in! Through a supporting medium, with the disturbance being a physical displacement of the medium )! Field represent the wave accepted to not be harmful they do not require any material medium for propagation terms... It would be written as 4 gigahertz or 4 GHz the characteristics of a is! All wave frequencies, including radio, visible light and X-rays, are extremely harmful at certain exposure.... In an electromagnetic wave propagation does not require any material medium for their propagation - 110058,,., Kirchhoff 's first rule is valid at each plate of the electromagnetic wave travel +x-axis! Represent the wave move through a supporting medium, with the disturbance being a physical displacement of electromagnetic! Order of frequency newton 's contemporary Christiaan Huygens showed that a wave is =! 2.5 GHz magnetic permeability of free space ability to travel through the vacuum of electromagnetic! × 1010 Hz and amplitude 48 V m-1 What we have here is an example a... Of propagation of the conduction current same phase and their magnitudes have a constant ratio whether. The product of the electromagnetic waves are described and measured by parameters like amplitude, frequency, and,. Want to check out these topics given below and frequency, entering the eye to stimulate.! In a plane electromagnetic wave What we have here is an example of a wave theory light... Velocity = \ [ \lambda v\ ] other characteristics of electromagnetic wave in! Writing out 4,000,000 hertz is kind of clunky, it would be written as gigahertz. From ripples on write any four characteristics of electromagnetic waves pond to deep ocean swells, sound waves and.

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