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Mechanical Properties Of Fluids

Question
CBSEENPH11019086

If we move away from the source of sound with speed of sound, we hear nothing. Why?

Solution
Apparent frequency when the observer moves away from the source is, 
                    straight v apostrophe equals fraction numerator straight V minus straight u subscript straight o over denominator straight V end fraction straight v 
when,
     straight V equals straight u subscript straight o comma space then 
     straight v apostrophe equals 0 
A note of zero frequency does not produce any sound.
Therefore, we will hear nothing.