The U. S. Navy has long proposed the construction of extremely low frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines. Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 77 Hz.

length of a quarter wavelength antenna for transmitter elf waves are zero

Explanation:

Find the length of a quarter wavelength antenna for transmitter elf waves

Given information

frequency (ELF waves) → 77Hz

Speed of light → 3m/s

where

→ wavelength of the antenna

f → frequency of the ELF waves

→  speed of light

so rewrite the equation in from

Substitute =

Substitute 75Hz = f

m

since we get this value,but this size of antenna mount on submarine is not possible.

so is zero

iron would move it is magnetic there is a mag field around the current in the wire