Answer:
14.32 Hz
Explanation:
Given:
Frequency of the horn, f₀ = 395 Hz
Speed of the car, v = 12.0 m/s
Speed of the sound, c = 343 m/s
now, applying the doppler's effect formula, we have
where,
f is the observed frequency
on substituting the values, we get
or
f = 409.32 Hz
therefore,
the beat frequency heard is = f - f₀ = 409.32 - 395 = 14.32 Hz
The beat frequency heard by the bystander is 14.32 Hz
Given that,
Emitting frequency = 395 Hz
Speed of cars = 12.0 m/s
Speed of sound = 343 m/s
We need to calculate the frequency
Using formula of frequency
Where, v = speed of sound
v' = speed of cars
f₀= emitting frequency
Put the value into the formula
We need to calculate the beat frequency heard by the bystander
Hence, The beat frequency heard by the bystander is 14.32 Hz.
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