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Ashok0210
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Asked: 2021-03-21T03:52:13+00:00 In:

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?

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Class 12 Physics
CBSE and UP Board
Electromagnetic Waves
Chapter-8 Exercise 8.4
NCERT Solutions for Class 12 Physics Chapter 8 Question 4

2020-2021cbse and up boardclass 12 chapter-8 physicsclass 12 physicsncert class 12 electromagnetic waves
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      The electromagnetic wave travels in a vacuum along the z-direction. The electric field (E) and the magnetic field (H) are in the x-y plane. They are mutually perpendicular. Frequency of the wave, ν = 30 MHz = 30 x 106 s⁻1
      Speed of light in a vacuum, c = 3 x 108 m/s Wavelength of a wave is given as:
      λ =c/ ν = (3 x 108)/(30 x 106) =10m

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