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The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at `18.0 km h^-1`? Speed of sound in air` = 340 m s^-1`

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The correct Answer is:
B, C, D
`f_1=((u+v_m-v_0)/(v+v_m-v_s))F`
[1km/h=5m/s]
using sign conventions
App frequency `=((340+0-0)/(340+0-5))xx2400`
`=2436Hz`
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A person riding a car moving at 72 km h^-1 sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing on the road (a) in front of the car (b) behind the car ? Speed of sound in air = 340 m s^-1 .

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A car moving at 108 km h^-1 finds another car in front of it going in the same direction at 72 km h^-1 . The first car sounds a horn that has a dominant frequency of 800 Hz. What will be the apparent frequency heard by the driver in the front car ? Speed of sound in air = 330 ms^-1

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Find the fundamental, first overtone and second overtone frequencies of an open organ pipe of length 20 cm. Speed of sound in air is 340 m s^-1 .

A train approaching a platform at a speed of 54 km h^-1 sounds a whistle. An observer on the platform finds its frequency to be 1620 Hz. The train passes the platform keeping the whistle on and without slowing down. What frequency will the observer hear after the train has crossed the platfrom ? The speed of sound in air = 332 ms^-1

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