First slide

Doppler

Question

A bus moving away from a wall with a speed of 10 m/s blows siren at frequency 680 Hz. If speed of sound in air is 330 m/s, the frequency heard by driver of bus is

Moderate

A

only 680 Hz
B

only 640 Hz
C

722.5 Hz
D

Both (1) & (2)

Solution

$f r e q e n c y o f t h e r e f l e c t e d s o u n d w i t h r e s p e c t t o b u s d r i v e r i s (\frac{v - v_{0}}{v + v o}) n (o b s e r v e r a n d v i r t u a l s o u r c e m o v i n g a w a y f r o m e a c h o t h e r) (\frac{330 - 10}{330 + 10}) 680 = 640 s o h e w i l l h e a r b o t h d i r e c t 680 a n d r e l e c t e d s o u n d 640 H z$

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