# Problem: (a)  What is the frequency of an electromagnetic wave with a wavelength of 20 cm? (b) What would be the wavelength of a sound wave in water with the same frequency as the electromagnetic wave of part a?

###### FREE Expert Solution

(a)

Frequency is expressed as:

$\overline{){\mathbf{f}}{\mathbf{=}}\frac{\mathbf{v}}{\mathbf{\lambda }}}$, where vis the velocity of an electromagnetic wave and λ is the wavelength.

The velocity of an electromagnetic wave is, v = c = 3.0 × 108 m/s

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###### Problem Details

(a)  What is the frequency of an electromagnetic wave with a wavelength of 20 cm?

(b) What would be the wavelength of a sound wave in water with the same frequency as the electromagnetic wave of part a?