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27 Which one of the following is the property of a monochromatic plane electromagnetic wave in free space a Electric and magnetic fields have a phase difference of 7 2 b The energy contribution of both electric and magnetic fields are equal c The direction of propagation is in the direction of Bx E d The pressure exerted by the wave is the product of its speed and energy density The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to a the speed of light in vacuum b reciprocal of speed of light in vacuum c the ratio of magnetic permeability to the electric susceptibility of vacuum d unity 31 The amplitude of the magnetic field of a harmonic electromagnetic wave in vacuum is Bo 510 nT The amplitude of the electric field part of the wave is a 120 NC 1 b 134 NC d 153 NC c 510 NC 1 a 2 10 T c 6 10 T 32 A plane electromagnetic wave of frequency 50 MHz travels in free space along the x direction At a particular point in space and time E 6 3 V m At this point B is equal to a 8 33 108 KT c 4 1 10 T 33 An electromagnetic wave is propagating along x axis At x 1 m and t 10 s its electric vector E 6 V m then the magnitude of its magnetic vector is b 18 9 108 T d 2 1 10 T b 3x10 T d 5 10 T 34 Which of the following is not true for electromagnetic waves a They transport energy b They have momentum c d They travel at different speeds in air depending on their frequency They travel at different speeds in medium depending on their frequency A plane electromagnetic wave travels in free space c d along X direction If the value of B in tesla at a 37 The frequency of electromagnetic wave which is best particular point in space and time is 1 2 x 10 k the value of E in V m at that point is suitable to observe a particle of radius 3 x 10 cm is of the order of a 10 5 Hz a 1 2 b 3 6k c 1 2k d 3 6 c 10 Hz 35 The photon energy in units of eV for electromagnetic waves of wavelength 2 cm is a 2 5 x 10 19 c 3 2 x 10 16 b 5 2 x 10 d 6 2 x 10 5 36 The electric field of an electromagnetic wave travelling through vacuum is given by the equation E E sin kx ot The quantity that is independent of wavelength is a kto b A plane electromagnetic wave of frequency 25 MHz vacuum is travels in free space along x direction At a particular 38 The electric field part of an electromagnetic wave in point in space and time electric field E 6 3 V m The magnitude of magnetic field B at this point is a 1 2 x 10 6 T c 2 1 10 T b 1 2 x 10 T d 2 1 x 10 T b 10 4 Hz d 10 2 Hz 181 E 3 1 The wavelength of this part of electromagnetic wave is a 1 5 m b 2 m c 2 5 m d 3 5 m E 2 5 cos 2 E 0 The wave is 39 In the question number 38 the frequency corresponding to the given part of electromagnetic wave is a 5 4 x 10 Hz c 3 2 10 Hz rad 4x10 b 8 6 x 10 Hz d 4 8 x 10 Hz 40 In the question 38 the amplitude of magnetic field part of the given wave is a 2 10 T c 4 22 10 T 2x10 41 The electric field part of an electromagnetic wave in a medium is represented by E 0 1 x10 4 b 1 03 10 T d 5 x 10 T m rad

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