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Find-the-velocity-of-the-source-along-the-line-joining-the-source-to-a-stationary-observer-if-as-a-result-of-the-motion-the-frequency-of-the-note-heard-is-a-increased-in-the-ratio-18-15-b-decreased-i




Question Number 35879 by NECx last updated on 25/May/18
Find the velocity of the source   along the line joining the source  to a stationary observer if,as a  result of the motion,the frequency  of the note heard is  a)increased in the ratio 18:15  b)decreased in the ratio 15:18
Findthevelocityofthesourcealongthelinejoiningthesourcetoastationaryobserverif,asaresultofthemotion,thefrequencyofthenoteheardisa)increasedintheratio18:15b)decreasedintheratio15:18
Answered by tanmay.chaudhury50@gmail.com last updated on 25/May/18
a)((f′)/f)=(v/(v−v_s ))=((18)/(15))  18v−18v_s =15v  3v=18v_(s   ) v_s =(v/6)   v_s =((330)/6)=55meter/second  b)((f′)/f)=(v/(v+v_s ))=((15)/(18))  15v+15v_s =18v  v_s =((3v)/(15))=(v/5)  v_s =((330)/5)=66m/sec
a)ff=vvvs=181518v18vs=15v3v=18vsvs=v6vs=3306=55meter/secondb)ff=vv+vs=151815v+15vs=18vvs=3v15=v5vs=3305=66m/sec

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