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The frequency of an electromagnetic radiation is $2 \times 10^6 \mathrm{~Hz}$. What is its wavelength in metres (Velocity of light $=3 \times 10^8 \mathrm{~ms}^{-1}$ )
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The correct answer is:
$1.5 \times 10^2$
When $c=v \times \lambda$ than $\lambda=\frac{c}{v}=\frac{3 \times 10^8}{2 \times 10^6}=1.5 \times 10^2 \mathrm{~m}$
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