Question

An echO is heard 0.4s after a boy lights a fire cracker 66 m away from a hogh building. What is the speed of sound

Answer 1

Given that,

An echo is heard 0.4 s after a boy lights a fire cracker 66 m away from a high building.

To find,

Speed of sound.

Solution,

The speed of sound is given by total distance divided by total time taken by the sound. The total distance covered by the sound to receive an echo is 2d. So,

$v=\dfrac{2d}{t}\\\\v=\dfrac{2\times 66\ m}{0.4\ s}\\\\v=330\ m/s$

So, the speed of sound is 330 m/s

Learn more,

Speed of sound

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Answer 2

Explanation:

Time = 0.4s

Distance = 66m

By echo ranging method -

Distance = Speed × Time

2d = s × t

2×66 = s × 0.4s

132 = s × 0.4s

speed = 132 m

0.4 s

= 132×10

4

= 330m/s or 330ms-1 is the answer..