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here is a question i was solving and confused between 2 ans 2 persons A and B, each carrying a source of sound of frequency f, are standing a few metres apart in a quiet field. A starts moving towards B with a speed u. If v is the speed of sound, the number beats heard per second by A will be so A is the observer,velocity of the observer is u and on applying in the equation we get apparent frequency as (v+u/v) f and beats as fu/v But if i consider A at rest, relative velocity of B will be -u( i.e towards A with a speed u). From this i get appparent frequency as (v/v+u)f and beats as (v/v-u)f. help me to identify which is correct

here is a question i was solving and confused between 2 ans
 
2 persons A and B, each carrying a source of sound of frequency f, are standing a few metres apart in a quiet field. A starts moving towards B with a speed u. If v is the speed of sound, the number beats heard per second by A will be
 
so A is the observer,velocity of the observer is u and on applying in the equation we get apparent frequency as (v+u/v) f and beats as fu/v
 
But if i consider A at rest, relative velocity of B will be -u( i.e towards A with a speed u). From this i get appparent frequency as (v/v+u)f and beats as (v/v-u)f.
 
help me to identify which is correct

Grade:12th pass

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
2 years ago
Dear student

The second conclusion is wrong

Kindly attach the question’s image

Regards

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