Q.

If vm is the velocity of sound in moist air, vd is the velocity of sound in dry  air, under identical conditions of pressure and temperature

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a

vm > vd

b

vm < vd

c

vm = vd

d

vmvd = 1

answer is A.

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Detailed Solution

The density of moist air (i.e. air mixed with water vapours) is less than the density of dry air  Hence from v=γPρ⇒vmoist air>vdry air
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If vm is the velocity of sound in moist air, vd is the velocity of sound in dry  air, under identical conditions of pressure and temperature