Question

Communication with submerged submarines via radio waves is difficult because seawater is conductive and absorbs electromagnetic waves. Penetration into the ocean is greater at longer wavelengths, so the United States has radio installations that transmit at 76Hz for submarine communications.What is the approximate wavelength of those extremely low-frequency waves?500 km1000 km2000 km4000 km

Answer 1

Answer:

$\lambda=4000\ km$

Explanation:

It is given that,

Frequency for submarine communications, f = 76 Hz

We need to find the wavelength of those extremely low-frequency waves. the relation between the wavelength and the frequency is given by :

$c=f\times \lambda$

$\lambda=\dfrac{c}{f}$

$\lambda=\dfrac{3\times 10^8\ m/s}{76\ Hz}$

$\lambda=3947368.42\ m$

$\lambda=3947\ km$

or

$\lambda=4000\ km$

So, the wavelength of those extremely low-frequency waves is 4000 km. Hence, this is the required solution.