Waves - Result Question 70
72. A source of sound S emitting waves of frequency and an observor are located at some distance from each other. The source is moving with a speed of at an angle of with the source observer line as shown in the figure. The observor is at rest. The apparent frequency observed by the observer is (velocity of sound in air )
[2015 RS]
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Answer:
Correct Answer: 72. (a)
Solution:
- (a) Here, original frequency of sound,
Speed of source
From Doppler’s formula
Apparent frequency