Question

FM Radio waves have their frequency 108 Hertz. Wavelength of these waves is

(speed of light = 3 × 108 ms–1)

Answer 1

Explanation:

we know that V= f× wavelength

3×10-8= 108× wavelength

wavelength= 3×10-8/108

wavelength= 3× 10-16 m

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Answer 2

The wavelength of the FM radio waves is 2.78×10⁶ m.

Given:

Frequency of FM radio waves, f = 108 Hertz

speed of light, c = 3 × 10⁸ ms⁻¹

To Find:

The wavelength of the FM radio waves.

Solution:

We are required to find the wavelength of the FM radio waves.

The relation between speed, frequency, and wavelength is given as

Frequency, f = speed(c)/ wavelength(λ)

wavelength(λ) = speed(c)/ Frequency(f) ------(1)

c = 3 × 10⁸ ms⁻¹

f = 108 Hertz

On substituting the values of c and f in equation(1) we get

wavelength(λ) = 3 × 10⁸/108

wavelength(λ) = 2.78×10⁶ m

Therefore, The wavelength of the FM radio waves is 2.78×10⁶ m.

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