The frequency you hear if the cop was driving away from you at a speed of 25 m/s is 652 Hz. The correct option is C.
It is the number of oscillations per second of the sinusoidal wave.
A cop car’s siren has a frequency of 700. H z. If you are standing on the sidewalk as the cop car approaches you at a speed of 15.0 m/ s.
The cop was driving away from you at a speed of 25 m/s. The speed of sound is 343 m/ s.
The frequency you hear will be calculated using the following formula
f' = f(Vs - Vo)/(Vs +Vc)
Substitute the values into the above equation, we get
f' = 700 x (343 - 0) / (343 + 25)
f' = 652.45 Hz
or f' = 652 Hz
Thus, the frequency you hear when the cop is driving away is 652 Hz.
Learn more about frequency.
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