A car moving at 108 km h^-1 finds another car in front of it going in the same direction at 72 km h^-1. The first car sounds a horn that has a dominant frequency of 800 Hz. What will be the apparent frequency heard by the driver in the front car ? Speed of sound in air = 330 ms^-1
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According to the question velocity of car A <br> `=V_A=18 km/h=30 m/s` <br> `V_B=72km/h=20m/s, f=800Hz` <br> So, the apparent frequency heard by the car B is given by <br> `f^1=((330-20)/(330-30))xx800=826.9` <br> `=~ 827Hz`