HARD
JEE Main
IMPORTANT
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An observer starts moving with uniform acceleration towards a stationary sound source emitting a whistle of frequency . As the observer approaches source, the apparent frequency heard by the observer varies with time as,
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Important Questions on Sound Wave And Doppler Effect
MEDIUM
JEE Main
IMPORTANT
A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time . How does the frequency of the whistle as heard by the man changes with time?
HARD
JEE Main
IMPORTANT
An observer approaches towards a stationary source of sound at constant velocity and recedes away at the same speed. The graph of wavelength observed with time is:
MEDIUM
JEE Main
IMPORTANT
A curve is plotted to represent the dependence of the ratio of the received frequency to the frequency emitted by the source, on the ratio of the speed of observer to the speed of sound , in a situation in which an observer is moving towards a stationary sound source. The curve is best represented by:
HARD
JEE Main
IMPORTANT
The difference between the apparent frequency of a source of sound, as perceived by an observer during its approach, and recession is of the natural frequency of the source. If the velocity of sound in air is , the velocity of the source is (It is given that velocity of source velocity of sound)
HARD
JEE Main
IMPORTANT
Two cars are moving on two perpendicular roads towards a crossing, with uniform speed of and . If the first car blows horn of frequency , then the frequency of the horn heard by the driver of second car, when line joining the cars make angle with the roads, will be
HARD
JEE Main
IMPORTANT
A police car moving at , chases a motorcyclist. The policeman sounds his horn at , while both of them move towards a stationary siren of frequency . Calculate the speed of the motorcycle, if it is given that, he does not observes any beats.
MEDIUM
JEE Main
IMPORTANT
A car is initially at rest, away from a stationary observer. It begins to move towards the observer with an acceleration of , sounding its horn continuously. later, the driver stops sounding the horn. The velocity of sound in air is . The observer will hear the sound of the horn for a duration of
HARD
JEE Main
IMPORTANT
Two persons and , each carrying a source of frequency and , respectively, are standing at rest, a few apart. starts moving towards with a velocity of . If the speed of sound is , which of the following statement is true?
