19. Sound waves produced by a source are audible to humans if the frequency of the produced sound is within audible range in (a) water (b) air (c) nitrogen (d) vacuum
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Answer:
(d) vaccum
Explanation:
(a) water had loosely packed molecules so if sound is loving from water it may rich much faster than air.
(b)sound travel normally in air as we can in our daily life
(c) as nitrogen is air so that it can move normally as in air in nitrogen
(d) but sound can not travel in vaccum
so,the answer is vaccum
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