A siren of frequency n approaches a stationary observer and then receedes from the observer. If the velocity of source (V) lt ltthe velocity of sound (C ), the apparent change in frequency is

A siren of frequency n approaches a stationary observer and then recee

1.	A siren of frequency n approaches a stationary observer and then receedes from the observer. If the velocity of source (V) lt ltthe velocity of sound (C ), the apparent change in frequency is
Answer» <html><body><p>`2nV//C`<br/>`2nC//V`<br/>`n//V`<br/>`2VC//n`</p>Solution :`n.=n((V)/(V-V_(S)))=n((C )/(C-V))` <br/> `n..=n((C )/(C+V))` <br/> `Deltan..=n.-n..=<a href="https://interviewquestions.tuteehub.com/tag/nc-576183" style="font-weight:bold;" target="_blank" title="Click to know more about NC">NC</a>[(1)/(C-V)-(1)/(C+V)]` <br/> `=nC[(<a href="https://interviewquestions.tuteehub.com/tag/2v-300496" style="font-weight:bold;" target="_blank" title="Click to know more about 2V">2V</a>)/(C^(2)-V^(2))]` <br/> `V^(2)`can be <a href="https://interviewquestions.tuteehub.com/tag/neglected-7377285" style="font-weight:bold;" target="_blank" title="Click to know more about NEGLECTED">NEGLECTED</a> as `V lt lt C :. Deltan.=(2nV)/(C )`</body></html>