Question

new generation cordless phones use a 9.00x10^2 MHz frequency and can be operated up to 60.0 m from their base. how many wavelengths of the electromagnetic waves can fit between your ear and a base 60.0 m away?

Answer 1

λ = 3*10^8 / 9*10^8 = 1/3 m
no. of wavelengths = 60/(1/3) = 180

Answer 2

The number of wavelengths of the electromagnetic waves can fit between your ear and a base 60.0 m away are 180.

What is wavelength?

The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.

Wavelength λ = c/f

where c is the speed of light in vacuum = 3*10⁸ m/s

Cordless phones use a a frequency of 9.00x10² MHz =  9*10⁸ Hz, then the wavelength will be

λ = c/f

λ = 3*10⁸ / 9*10⁸ = 1/3 m

no. of wavelengths = 60 m /(1/3 m) = 180

Thus, the  number of wavelengths of the electromagnetic waves can fit are 180.

Learn more about wavelength.

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