When both source and listener are approaching each other the obse… - Vidyadip

MCQ

When both source and listener are approaching each other the observed frequency of sound is given by ( $V_L$ and $V_S$ is the velocity of listener and source respectively, $n_0=$ radiated frequency)

✓
$n=n_0\left[\frac{V+V_L}{V-V_S}\right]$
B
$n=n_0\left[\frac{V-V_L}{V+V_S}\right]$
C
$n=n_0\left[\frac{V-V_L}{V-V_S}\right]$
D
$n=n_0\left[\frac{V+V_L}{V+V_S}\right]$

✓

Answer

Correct option: A.

$n=n_0\left[\frac{V+V_L}{V-V_S}\right]$

(a) :As, both source and listener are approaching to each other.
So, by Doppler's effect
$
n=n_0\left(\frac{V+V_L}{V-V_S}\right)
$

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