At a prayer meeting, the disciples sing JAI-RAM JAI-RAM. The sound amplified by a loudspeaker comes back after reflection from a building at a distance of 80 m from the meeting. What maximum time interval can be kept between one JAI-RAM and the next JAI-RAM so that the echo S eed of does not disturb a listener sitting in the meeting. p sound in air is `320 m s^-1`.

Explanation

Here given `s=80mxx2=160m`
`v=320m/s`
So, the maximum time interval will be
`t=s/v=160/320=0.5seconds`