Question

An electromagnetic wave has a frequency of $500MHz$ and a wavelength of $60cm$. Calculate the velocity of the wave.

• A. $3\times {10}^{8}km{s}^{-1}$
• B. $3\times {10}^{8}cm{s}^{-1}$
• C. $3\times {10}^{-8}m{s}^{-1}$
• D. $3\times {10}^{8}m{s}^{-1}$

Answer 1

The correct option is D $3\times {10}^{8}m{s}^{-1}$

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 $60cm=0.6m$
Hence, the velocity of the wave is $3\times {10}^{8}m/s$.