A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350ms−1. (a) By how much is the phase changed at a given point in 2.5 ms? (b) What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?
Here given, n =100, v =350 m/s
In 2.5 ms, the distance travelled by the particle is given by
So, phase difference,
(b)In the second case,