T h e   s e n s a t i o n   o f   s o u n d   p e r s i s t s   i n   o u r   e a r s   f o r   0 . 1 s . i f   t h e   p e r s i s t e n c e   w a s 0 . 2 s   i n s t e a d   t h e n   h o w   c l o s e   c a n   t h e   o b j e c t   b e   p l a c e d   s o   t h a t   a n   e c h o   i s   h e a r d ? ( a s s u m e   s o u n d   s p e e d = 344 m / s ) A )   17 . 2 m B )   34 . 4 m C )   68 . 8 m D )   8 . 6 m

Dear Student ,

Q-8
The sensation of sound persists in our brain if the minimum distance of the obstacle from the source of sound is 17.2m .
So option (A) is correct.
Kindly post different query in separate thread.
Regards

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