Sound Questions

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :

Two vibrating tuning forks produce progressive waves given by y1 = 4 sin 500 πt and y 2 = 2 sin 506 πt. Number of beats produced per minute is :

The driver of a car travelling with speed $30\text{m/sec}$ towards a hill sounds a horn of frequency $600\text{Hz}$. If the velocity of sound in air is $330\text{m/s}$, the frequency of reflected sound as heard by driver is:

A tuning fork of frequency $512\text{ Hz}$ makes $4\text{ beats per second}$ with the vibrating string of a piano. The beat frequency decreases to $2\text{ beats per sec}$ when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was: