First slide

Doppler's effect

Question

An observer is moving towards the stationary source of sound, then

Easy

A

Apparent frequency will be less than the real frequency
B

Apparent frequency will be greater than the real frequency
C

Apparent frequency will be equal to real frequency
D

Only the quality of sound will change

Solution

Apparent frequency in this case $n' = \frac{n (v + v_{0})}{v}$
$∵ \frac{v + v_{0}}{v} > 1 \Rightarrow \frac{n'}{n} > 1 i . e . n' > n$

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