Answer :
The frequency heard by a person is 835.29 Hz.
We are given that,
Speed of sound = v = 340.6m/s
Speed of person = Vd = 15m/s
Upon approaching the source of the sound, frequency will be given by
f'=f(Vd+ v)/v
Where f is the source frequency, Vd is the vehicle's speed, v is the sound-traveling speed in air, and f' is the known frequency when moving forward if f is replaced with 800 Hz, v with 340 m/s, and Vd with 15 m/s, then
f'=800(15+340)/340
f'=835.29Hz
The frequency is 835.29 Hz when rounded off.
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