The frequencies of two sound sources are 256 Hz and 260 Hz, At `t=0` the intesinty of sound is maximum. Then the phase difference at the time `t=1//16` sec will be

If the frequency of two sources of sound are 512 Hz and 516 Hz then the time interval between two consecutive beats produced by sounding them together will be

Two waves of frequencies 20 Hz and 30 Hz. Travels out from a common point. The phase difference between them after 0.6 sec is

A source of sound is moving towards a high wall with a speed of 20 m/s. The frequency of the sound produced by the source is 400 Hz. If the speed of the sound is 340 m/s, then the beat frequency heard by a person standing near the wall will be

If the difference between the frequencies of two sound notes is 8Hz , then the time interval between successive maximum intensity, is