Question

sunil is standing between two parallel walls. The wall closest to him is at distance of 660 m. If he shouts, he hears the first echo after 4s and another 2s.

1.what is the velocity of sound in air?
2.what is the distance between the two walls? ​


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Answer 1

Answer:

ans is 330m /s

Explanation:

• we know that 2d=vt and we need to find the velocity that is speed of sound in air...
• 2*660=v*4sec..
• (660*2)/4
• =330m/s

hope it helps you..

Answer 2

Correct question:

- Sunil is standing between two walls the wall closest to him is at a distance of 660m if he shouts he hears the first echo after 4s and another after another 2 seconds .

Answer:

Velocity = 330m/s

Distance between two walls = 1650 meters

Given information:

Suppose sunil is standing is a room between 2 walls.

Wall closest to sunil is at distance of 660 meters.

And, If he shouts, then he heard the Echo from his nearest wall in 4 seconds.

And, Another wall echo is heard in next 2 seconds.

To find: i) Velocity of sound in Air ?

             ii) Distance between two walls

Explanation:

Method I :

i) Velocity of sound in Air:

Velocity = Distance /  Time/2 (Because we heard sound after getting reflected back)

Velocity = 660 /  2

Velocity = 330 m/s

Therefore, Velocity of sound in Air is 330 m/s.

ii) What is the distance between two walls ?

For first wall,

Distance = ?

Velocity = 330 m/s

Time = 4 seconds

Distance = Velocity * time

Distance = 330 * 4

Distance = 1320 meters -------- (i)

For second wall,

Distance = ?

Time = 2 seconds

Velocity = 330 m/s

Distance = Velocity * 2/ time

Distance = 330 * 1

Distance = 330 meters ------- (ii)

Adding equation (i) and (ii),

Distance between 1st wall  + Distance between 2nd wall = Distance between two walls

Distance between two walls = 1320 + 330

Distance between two walls = 1650 meters

Therefore, Distance between 2 walls is 1650 meters.

Method II :

i) Velocity of sound:

Velocity of sound = Distance/time

Velocity of sound = 660/2

Velocity of sound = 330 m/s

ii) Distance between two walls:

Distance = Velocity * total time

Distance = 330 * 6

Distance = 1650 meters