The amplitude modulated (AM) radio wave bends appreciably round t… - Vidyadip

MCQ

The amplitude modulated (AM) radio wave bends appreciably round the corners of a 1m × 1m board but the frequency modulated (FM) wave only negligibly bends. If the average wavelengths of AM and FM waves are $\lambda_\text{a}$ and $\lambda_\text{f}:$

A
$\lambda_\text{a}>\lambda_\text{f}$
✓
$\lambda_\text{a}=\lambda_\text{f}$
C
$\lambda_\text{a}<\lambda_\text{f}$
D
We don't have sufficient information to decide about the relation of $\lambda_\text{a}$ and $\lambda_\text{f}$

✓

Answer

Correct option: B.

$\lambda_\text{a}=\lambda_\text{f}$

An electromagnetic wave bends round the corners of an obstacle if the size of the obstacle is comparable to the wavelength of the wave. An AM wave has less frequency than an FM wave, So, an AM wave has a higher wavelength than an FM wave and it bends round the comers of a 1m × 1m board.

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