Question

if the speed of sound is 344 m/s. Find the minimum distance between source of sound and obstacle so that echo is directly heard from box.​

Answer 1

Answer:17.2m

Explanation:

Time in which echo heard=

2s=VT

2s=344m*0.1sec

s=344/20

s=17.2 m

Answer 2

The minimum distance between source of sound and obstacle is 17.2 m so that echo is directly heard form box.

Explanation:

Speed of sound=$v=344m/s$

Sensation of sound in our brain persist for 0.1 s

Therefore, time=0.1 s

We know that

Total distance=$2d=v\times t$

Substitute the values

$2d=344\times 0.1$

$d=\frac{344\times 0.1}{2}$

$d=\frac{34.4}{2}$

$d=17.2$m

Hence, the minimum distance between source of sound and obstacle is 17.2 m so that echo is directly heard form box.

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