Wave Motion 5 Question 26
26. A train approaching a hill at a speed of
(a) the frequency of the whistle as heard by an observer on the hill,
(b) the distance from the hill at which the echo from the hill is heard by the driver and its frequency.
(Velocity of sound in air
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Answer:
Correct Answer: 26. (a)
Solution:
- Given
(a) Frequency observed by observer
Substituting the values, we have
(b) Let
Solving this equation, we get
Frequency heard by the driver of the reflected wave
