A listener is at rest with respect to the source of sound. A wind… - Vidyadip

MCQ

A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?

Frequency.
Velocity of sound.
Wavelength.
Time period.

A
Only $A$
✓
$A$ and $D$
C
$B$ and $C$
D
only $D$

✓

Answer

Correct option: B.

$A$ and $D$

The frequency does not change. Hence, the time period $($inverse of frequency$)$ also remains the same. Due to wind, the relative velocity of sound changes. Thus, the wavelength also changes so as to keep the frequency the same. $($As $\nu=\nu\lambda)$

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