Question

A system proposed by the U.S. Navy for underwater submarine communication, called ELF (for extremely low frequency), operates with a frequency of 30Hz . What is the wavelength of this radiation in meters

Answer 1

Answer

Wavelength= 30*20^8/30=10^7m

Explanation:

Velocity = frequency *wavelength

We're frequency=30HZ

Velocity of light= 3*10^8m/s

Wavelength= 30*20^8/30=10^7m

Explanation:

Answer 2

Answer:

the wavelength of this radiation is 10 × 10⁶m = 10⁷m

Explanation:

Frequency, v = 30Hz = 30s⁻¹

wavelength of radiation = λ

Wavelength = speed of light / frequency

c = speed of light

c = 3 × 10⁸m/s

v = frequency

Wavelength =  3 × 10⁸ / 30

Wavelength = 10000000

Wavelength = 10 × 10⁶m

Wavelength = 10⁷m

Hence,  the wavelength of this radiation is 10 × 10⁶m = 10⁷m