IIT JEE , AIEEE Forum - Physics , Mechanics

Decoder

lookk u want a beat frequency of 200Hz..

draw the diagram...with both source & detector on +ve side of x-axis..

now .think when is the max. frequency detected..

by doppler effect it will be max. wen source moves with max. velocity ...( in s.h.m tht is at mean pos.)..

now the ques. comes source moves towards observer or away frm it..

in case of away the frequency detected will be least..

so wat is tht velocity... ==>> wA..
where both of them r given to u..
solve for both..

take the diffrence and equate it to 200..

cheers.!

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