Question

A radio station transmits waves of wavelength 400 m. If the speed of the waves is $4\times {10}^{8}m{s}^{-1}$, Find the frequency of the radio station.

• A. 1 MHz
• B. 2 MHz
• C. 4 MHz
• D. 5 MHz

Answer 1

The correct option is A 1 MHz

The relation between wavelength $\left(\lambda \right)$, wave speed $\left(v\right)$ and frequency $\left(f\right)$ is $v=f\lambda$

Thus, $f=\frac{v}{\lambda }=\frac{4\times {10}^8}{400}={10}^{6}Hz=1MHz$