First slide

Doppler's effect

Question

A source and an observer are moving towards each other with a speed equal to $\frac{v}{2}$ where v is the speed of sound. The source is emitting sound of frequency n. The frequency heard by the observer will be

Moderate

A

Zero
B

n
C

$\frac{n}{3}$
D

3n

Solution

$n' = n (\frac{v + v_{0}}{v - v_{s}}) = n (\frac{v + v / 2}{v - v / 2}) = 3 n$

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