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  4. The velocity of electromagnetic waves in free space is 3 × 108 m / sec. The frequency of a radio wave of wave length 150 m, is

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Q. The velocity of electromagnetic waves in free space is $3 \times 10^{8} \,m / sec$. The frequency of a radio wave of wave length $150\, m$, is

AIIMSAIIMS 1996Electromagnetic Waves

Solution:

Given: Velocity of electromagnetic waves in free space $(v)=3 \times 10^{8}\, m / \,sec$ and wavelength $(\lambda)$
$=150\, m .$ We know that frequency $(f)=\frac{v}{\lambda}=\frac{3 \times 10^{8}}{150}$
$= 2 \times 10^{6} \,Hz =2\, MHz$