A wave is propagating in a medium of electric dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is

(1) 5 Ω

(2) 376.6 Ω

(3) 1883 Ω

(4) 3776 Ω

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Properties of EM waves
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The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by 

1. εoμo

2. μoεo

3. 1μoεo

4. μoεo

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The electric field part of an electromagnetic wave in a medium is represented by :

Ex=0;Ey=2.5NCcos2π×106radst -π×10-2radmxEz=0.The wave is-

1. moving along y-direction with frequency 2π×106 Hz and wavelength 200 m.

2. moving along +x-direction with frequency 106 Hz and wavelength 100 m

3. moving along +x-direction with frequency 106 Hz and wavelength 200 m

4. moving along - x-direction with frequency 106 Hz and wavelength 200 nm

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Generation of EM waves
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The electric field of an electromagnetic wave in free space is given by E=10 cos(107t+kx)j^ V/m, where t and x are in seconds and meters respectively. It can be inferred that

(1) The wavelength λ is 188.4 m.

(2) The wave number is 0.33 rad/m.

(3) The wave amplitude is 10 V/m.

(4) The wave is propagating along +x direction

 

Which one of the following pairs of statements is correct?

1.  (3) and (4)                                    2.   (1) and (2)

3.   (2) and (3)                                   4.   (1) and (3)  

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Which of the following statements is false for the properties of electromagnetic waves?

1. Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time

2. The energy in an electromagnetic wave is divided equally between electric and magnetic vectors 

3. Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave

4. These waves do not require any material medium for propagation

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The decreasing order of the wavelength of infrared, microwave, ultraviolet and gamma rays is

(a) gamma rays, ultraviolet, infrared, microwaves

(b) microwaves, gamma rays, infrared, ultraviolet

(c) infrared, microwave, ultraviolet, gamma rays

(d) microwave, infrared, ultraviolet, gamma rays

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The electric and the magnectic field, associated with an electromagnetic wave, propagating along the +z-axis, can be represented by

1.  E=E0k^, B=B0I^˙                                                2.   E=E0j^, B=B0j^

3.   E=E0j^, B=B0k^                                                 4.   E=E0i^, B=Boj^

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The ratio of the amplitude of the 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

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The electric field associated with an electromagnetic wave in vacuum is given by E= 40coskz-6×108t,where E, z, and t are in volt/m, meter, and second respectively. The value of wave vector k is:

1. 2 m-1                               2. 0.5 m-1

3. 6 m-1                               4. 3 m-1             

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The condition under which a microwave oven heats up a food item containing water molecules most efficiently in



1. the frequency of the microwave must match the resonant frequency of the water molecules

2. the frequency of the microwave  has no relation with the natural frequency of water molecules

3. microwave are heatwaves, so always produce heating

4. infrared waves produce heating in a microwave oven
 

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