Respuesta :
The frequency observer would hear is 732 Hz.
What is frequency?
Frequency is the number of occurrences of a repeating event per unit of time.
[tex]f=\frac{1}{T}[/tex]
What is Doppler EFFECT?
The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
[tex]f_{o} = f_{s} \frac{v-v_{0} }{v-v_{s} }[/tex]
Where
[tex]f_{o}[/tex] = observer frequency of sound
[tex]f_{s}[/tex] = actual frequency of sound wave
[tex]v[/tex] = velocity of sound
[tex]v_{o}[/tex] = velocity of observer
[tex]v_{s}[/tex] = velocity of source
Here,
[tex]f_{s}[/tex] = 700 Hz,
[tex]v[/tex] = 343 m/s,
[tex]v_{o}[/tex] = 0 m/s,
[tex]v_{s}[/tex] = 15 m/s
We have to find [tex]f_{o}[/tex]
On putting values in above formula
[tex]f_{o} = 700\frac{343-0 }{343-15 }[/tex]
[tex]f_{o}[/tex] = 732Hz
To know more about Doppler Frequency here
https://brainly.com/question/14343020
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