When a long hollow cylindrical iron pipe is struck at one end, then at the other end of the pipe :

one sound is only heard

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two sounds are heard at different intervals

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three sounds are heard at different intervals

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no sound is heard

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Solution

The correct option is B two sounds are heard at different intervals
There will be two sounds, one will through the air , and other will come through the material, Sound speed is faster in steel, therefore it will be heard earlier than the sound from air . Option "B" is correct.

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When a long hollow cylindrical iron pipe is struck at one end, then at the other end of the pipe :

The correct option is B two sounds are heard at different intervalsThere will be two sounds, one will through the air , and other will come through the material, Sound speed is faster in steel, therefore it will be heard earlier than the sound from air . Option "B" is correct.

The correct option is B two sounds are heard at different intervals
There will be two sounds, one will through the air , and other will come through the material, Sound speed is faster in steel, therefore it will be heard earlier than the sound from air . Option "B" is correct.