A Boy Fires a Gun and Hears the Echo 2 Seconds Later. If He is 480 M Away from a Wall, Calculate the Velocity of Sound in Air. - Physics

A boy fires a gun and hears the echo 2 seconds later. If he is 480 m away from a wall, calculate the velocity of sound in air.

संख्यात्मक

Velocity of sound = `"distance travelled"/"time taken" = (2"d")/"t"`

∴ Velocity of sound = `(2 xx 480)/2` = 480 m/s

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पाठ 3: Sound - Exercise 1 [पृष्ठ १४८]

पाठ 3 Sound
Exercise 1 | Q 4 | पृष्ठ १४८

Select the correct alternative :

We can hear sound of frequency

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(i) Its frequency is increased,
(ii) Its amplitude is increased?

In which medium the speed of sound is more: humid air or dry air? Give a reason to your answer.

How is the sound produced?

Select the correct option:

In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:

Consider the statement given below and choose the correct option.

Assertion: When lightning strikes, the sound is heard a little after the flash is seen.

Reason: The velocity of light is greater than that of the sound.

Describe with diagram, how compressions and rarefactions are produced.

A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case