A stone is dropped from a 500 m tall building into a pond. When is sound of splash heard after the dropping of the stone? g = 10 $m / s^{2}$ , speed of sound = 340 m/s

10 s

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1.47 s

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11.47 s

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immediately (at t = 0)

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Solution

The correct option is C
11.47 s

Sound needs time to reach places, let time required by stone to reach the pond be to

$S = u t + a t_{2}$

$- 500 = - \frac{1}{2} \times 10 \times t_{1}^{2}$

$t_{1} = 10 s$

time taken by sound to reach the top = $\frac{d i s t a n c e}{s p e e d}$

$t_{2} = 1.47 s$

total time after which splash is heard = $t_{1} + t_{2}$

= 10 + 1.47 = 11.47 s

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A stone is dropped from a 500 m tall building into a pond. When is sound of splash heard after the dropping of the stone? g = 10 m/s2, speed of sound = 340 m/s

The correct option is C 11.47 s Sound needs time to reach places, let time required by stone to reach the pond be to S=ut+at2 −500=−12×10×t21 t1=10s time taken by sound to reach the top =distancespeed t2=1.47s total time after which splash is heard =t1+t2 = 10 + 1.47 = 11.47 s

A stone is dropped from a 500 m tall building into a pond. When is sound of splash heard after the dropping of the stone? g = 10 $m / s^{2}$ , speed of sound = 340 m/s