A source and listener are both moving towards each other with speed $v/10$, where $v$ is the speed of sound. If the frequency of the note emitted by the source is $f$, the frequency heard by the listener would be nearly
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(b) When source and listener both are moving towards each other then, the frequency heard
$n' = n\,\left( {\frac{{v + {v_O}}}{{v - {v_S}}}} \right)$
$n' = n\,\left( {\frac{{v + {v_O}}}{{v - {v_S}}}} \right)$
==> $n' = f\,\left( {\frac{{v + v/10}}{{v - v/10}}} \right) = 1.22\,f.$
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