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Applications of Reflection of Sound

31.A car runn...

Question

31.A car running midway between parallel rows of buildings with velocity Vc blow horns and its echo from buildings is heard after time t,The distance between the parallel rows of buildings is (speed of sound in air is V)----------

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Solution

$L e t d i s t h e d i s \tan c e b e t w e e n t h e b u i l d i n g s . W h e n c a r i s i n t h e m i d w a y t h e n d i s \tan c e o f t h e c a r a n d t h e b u i l d n g i s \frac{d}{2} W h e n e c h o i s h e a r d a f t e r t i m e t t h e n, d i s \tan c e t r a v e l i s t w i c e t h e d i s \tan c e b e t w e e n t h e v a r a n d t h e b u i l d i n g . D = 2 \frac{d}{2} = d v = \frac{D}{t} D = v t d = v t .$

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