when a siren of the fire engine approaches an observer speed of 10m/s, taking the velocity of sound is 340m/s,if the frequency of siren is 600Hx,the frequency heard by the observes?
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11th
Physics
Waves
Doppler Effect in Sound
A source is moving towards ...
PHYSICS
A source is moving towards observer with a speed of 20 m/s and having frequency 240 Hz and observer is moving towards source with a velocity of 20 m/s. what is the apparent frequency heard by observer, if velocity of sound is 340 m/s?
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Key Idea the perceived frequency heard by the observer depends upon the relative motion between observer and source.
If the source and observer are approaching each other, then the velocity of the source v
s
is positive and velocity of the listener v
l
is negative, the perceived frequency will be higher than the original.
Perceived frequency is given by
n
′
=n(
v−v
0
v+v
0
) [∵n
′
=n
v−v
s
v−(−v
0
]
Here, v=340m/s,v
0
=20m/s,
v
s
=20m/s,n=240Hz
Hence, n
′
=240(
340−20
340+20
)
=240×
320
360
=270Hz
Note When the speed of source and observer are much lesser than that of sound, the change in frequency becomes independent of the fact whether the source is moving or the observer.
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