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Propagation of Sound

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Question

why we are not able to hear sound above 2o,ooo hz

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Solution

The design of the human ear is such that it is only sensitive to frequencies ranging between 20 - 20000 Hz. Anything above or below this range would be inaudible to us.

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Q. Science fiction films often show battles between spaceships. Four friends were arguing what would someone in space hear if an enemy spaceship exploded?
Rekha said, 'they would hear a big explosion.'
Renu saud,'they will not hear anything as there is no medium for sound to travel, but they can see the explosion.'
Ramesh said, 'yes, they will not hear anything and they will not be able to see the explosion.'
Raghav said,'the explosion produces sound of frequency above 20,000 Hz hence we cannot hear it.'
Who is correct?

Q. Science fiction films often show battles between spaceships. Four friends were arguing what would someone in space hear if an enemy spaceship exploded?
Rekha said, 'They would hear a big explosion.'
Renu said, 'They will not hear anything as there is no medium for sound to travel, but they can see the explosion.'
Ramesh said, 'Yes, they will not hear anything and they will not be able to see the explosion.'
Raghav said, 'The explosion produces sound of frequency above 20,000 Hz hence we cannot hear it.'
Who is correct?

(a) Rekha
(b) Renu
(c) Ramesh
(d) Raghav

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