Question

An electromagnetic wave has a frequency of $500MHz$ and a wavelength of $60cm$. Name the medium through which it is traveling.

• A. air
• B. water
• C. salt
• D. cardboard

Answer 1

The correct option is A air

The formula for velocity, when given wavelength and the frequency of the wave, is written as: $v=f\lambda$.
In this formula, $f$ represents frequency, $V$ represents the velocity of the wave, and $\lambda$ represents the wavelength of the wave.
Here, the frequency of the wave is $500MHz=500000000Hz$ and the wavelength is $60cm=0.6m$
Therefore, the velocity of the wave is $3\times {10}^{8}m/s$.
This determined velocity is the velocity of the light in air. Hence, the medium through which the wave is travelling is air.