A man fires a shot and hears an echo from a cliff after 2 seconds. He walks 85 m towards the cliff and echo of a second shot is now heard after 1.5 second. What is the velocity of sound?

85 in/sec

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170 m/sec

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340 m/sec

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680 m/sec

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Solution

The correct option is C 340 m/sec
When he walks 85 m towards the cliff then the echo of a second shot is now heard after 1.5 second. So it is clear from the figure is that:
in $1 / 4$ sec the round travel $= 85$ m
SO, in 1 sec, sound travel $= 4 \times 85 = 340$ m

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A man fires a shot and hears an echo from a cliff after 2 seconds. He walks 85 m towards the cliff and echo of a second shot is now heard after 1.5 second. What is the velocity of sound?

The correct option is C 340 m/secWhen he walks 85 m towards the cliff then the echo of a second shot is now heard after 1.5 second. So it is clear from the figure is that:in 1/4 sec the round travel=85mSO, in 1 sec, sound travel =4×85=340 m

The correct option is C 340 m/sec
When he walks 85 m towards the cliff then the echo of a second shot is now heard after 1.5 second. So it is clear from the figure is that:
in $1 / 4$ sec the round travel $= 85$ m
SO, in 1 sec, sound travel $= 4 \times 85 = 340$ m