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(C) The apparent frequency $n'$ heard by an observer when the source is moving towards a stationary observer is given by the Doppler effect formula:$n

Vedclass · Accepted Answer

$2068$

Vedclass · Answer

(C) The apparent frequency $n'$ heard by an observer when the source is moving towards a stationary observer is given by the Doppler effect formula:$n' = n \left( \frac{v}{v - v_S} ight)$Given:Frequency of source $n = 2000\, Hz$Velocity of sound $v = 1220\, km/h$Velocity of source $v_S = 40\, km/h$Substituting the values:$n' = 2000 	imes \left( \frac{1220}{1220 - 40} ight)$$n' = 2000 	imes \left( \frac{1220}{1180} ight)$$n' = 2000 	imes 1.033898...$$n' \approx 2067.79\, Hz$Rounding to the nearest whole number,we get $n' = 2068\, Hz$.

Column-$I$	Column-$II$
$A.$ $500$ million years ago	$1.$ Invertebrates
$B.$ $350$ million years ago	$2.$ Jawless fishes
$C.$ $320$ million years ago	$3.$ Sea weeds and few plants

$A$ source of sound is travelling with a velocity of $40\, km/h$ towards an observer and emits sound of frequency $2000\, Hz$. If the velocity of sound is $1220\, km/h$,what is the apparent frequency heard by the observer in $Hz$?

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