JEE Main 2016 Physics question
A toy-car, blowing its horn, is moving with a steady speed of m s, away from a wall. An observer, towards whom the toy car is moving, is able to hear 5 beats per second. If the velocity of sound in air is m s the frequency of the horn of the toy car is close to
Answer: (4)
Solution
The observer hears two sounds that differ slightly in frequency, and their superposition produces the beats. **Direct sound:** the car approaches the observer, so
= = .
**Reflected sound:** the car *recedes* from the wall, which receives and
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