A student holding a 324Hz tuning fork approaches a wall at a speed of 6ms^(−1) .The speed of sound in air is 336ms^(−1) .What frequency will the student detect from waves omitted from the fork and waves coming from the wall?


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Question Number 41962 by Necxx last updated on 16/Aug/18

$A s t u d e n t h o l d i n g a 324 H z t u n i n g$ $f o r k a p p r o a c h e s a w a l l a t a s p e e d$ $o f 6 {m s}^{- 1} . T h e s p e e d o f s o u n d i n a i r$ $i s 336 {m s}^{- 1} . W h a t f r e q u e n c y w i l l$ $t h e s t u d e n t d e t e c t f r o m w a v e s$ $o m i t t e d f r o m t h e f o r k a n d w a v e s$ $c o m i n g f r o m t h e w a l l ?$
Commented by tanmay.chaudhury50@gmail.com last updated on 16/Aug/18

	Answered by tanmay.chaudhury50@gmail.com last updated on 16/Aug/18

	$h e r e o b s e r v e r h o l d i n g t h e t u n i n g f o r k . . .$ $t h a t m e a n s s o u r c e o f s o u n d a n d o b s e r v e r$ $a r e m o v i n g w i t h s a m e v e l o c i t y . . .$ $i a m t r y i n g t o s o l v e i t . . .$ $1) f r e q u e n c y 324 H z w i l l b e h e a r d b y t h e s t u d e n t s$ $o m i t t e x f r o m t u n i n g f o r k . . .$ $2) f o r s e c o n d p a r t a s s u m e t h e r e f l e c t e d s o u n d$ $i s t h e s o u r c e o f s o u n d . . .$ $t a k i n g r e f e r e n c e f r o m a t t a c h e d c o m m e n t s$ $f = (\frac{c \pm v_{r}}{c \pm v_{s}}) f_{0}$ $f = (\frac{336 + 6}{336 - 6}) 324 = 335.78 \approx 336$ $p l s c h e c k a n d c o m m e n t . . .$
	Commented by Necxx last updated on 17/Aug/18

	$y e s s i r . T h i s i s t h e a n s w e r . T h a n k$ $y o u f o r y o u r h e l p a t a l l t i m e s .$
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