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NCERT Class XII Chapter
Electromagnetic Waves
Questions With Solutions

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Question : 4
Total: 15
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
Solution:  
electromagnetic wave, the electric field vector
→
E
 and magnetic field vector
→
B
 show their variations perpendicular to the direction of propagation of wave as well as perpendicular to each other. As the electromagnetic wave is travelling along z-direction, hence
→
E
 and
→
B
 show their variation in x-y plane.
Wavelength, λ =
c
v
 =
3×108m∕s
30×106s−1
 = 10 m
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