A boy is walking away from a wall towards an observer at a speed of 1 meter/sec and blows a whistle whose frequency is 680 Hz. The number of beats heard by the observer per second is (Velocity of sound in air = 340 meters/sec
Text Solution
Verified by ExpertsThe correct answer is:
D
Observer hears two frequencies
(i) 
which is coming from the source directly
(ii) 
which is coming from the reflection image of source
so, 
and 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Doppler shift in frequency does not depend upon
A source of sound of frequency 450 cycles/sec is moving towards a stationary observer with 34 m/sec…
The wavelength is 120 cm when the source is stationary. If the source is moving with relative veloc…
The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towa…
A source of sound emits waves with frequency f Hz and speed V m/sec. Two observers move away from t…
The source producing sound and an observer both are moving along the direction of propagation of so…