# If the Frequency of the Wave is 30 Mhz, What is Its Wavelength? - Physics

Numerical

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

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, v = 30 MHz = 30 × 106 s−1

Speed of light in a vacuum, c = 3 × 108 m/s

Wavelength of a wave is given as:

lambda = "c"/"v"

= (3 xx 10^8)/(30 xx 10^6)

= 10 m

Concept: Electromagnetic Spectrum
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#### APPEARS IN

NCERT Physics Part 1 and 2 Class 12
Chapter 8 Electromagnetic Waves
Exercise | Q 8.4 | Page 286
NCERT Class 12 Physics Textbook
Chapter 8 Electromagnetic Waves
Exercise | Q 4 | Page 286

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