Question

A submarine uses sub-radio communication at 200 Hz. What is the wavelength of the electromagnetic waves in water with index of refraction 1.333?

Answer 1

Answer:

Wavelength in water, $\lambda=1.12\times 10^6\ m$

Explanation:

Given that,

A submarine uses sub-radio communication at 200 Hz.

The index of refraction, n = 1.333

The refractive index of a medium is given by :

$\mu=\dfrac{c}{v}\\\\\mu=\dfrac{c}{\lambda_m f}\\\\\lambda_m=\dfrac{c}{\mu f}\\\\\lambda_m=\dfrac{3\times 10^8}{1.333\times 200}\\\\=1.12\times 10^6\ m$

So, the wavelength of the electromagnetic waves in water is $1.12\times 10^6\ m$.