The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at 18.0 kin/h? Speed of sound in air = 340 m/s.

Question

Philoid · Accepted Answer

As a result of Doppler’s effect the frequency will change and it can be found by,

Here,

v = 340 ms^-1.

V_s=18kmh^-1 = 5 ms^-1.

f₀ = 2400Hz

Now,