A sound source is moving towards a stationary observer with 1/10 … - Vidyadip

MCQ

A sound source is moving towards a stationary observer with $1/10$ of the speed of sound. The ratio of apparent to real frequency is

✓
$10/9$
B
$11/10$
C
${(11/10)^2}$
D
${(9/10)^2}$

✓

Answer

Correct option: A.

$10/9$

a
(a) $n' = n\,\left( {\frac{v}{{v - {v_S}}}} \right) = n\,\left( {\frac{v}{{v - v/10}}} \right)\,$

==> $\frac{{n'}}{n} = \frac{{10}}{9}$

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