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-wav

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 \dots

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 \dots

i a m t r y i n g t o s o l v e i t \dots

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 \dots

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 \dots

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 \dots

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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