At a prayer meeting, the disciples sing JAI-RAM JALRAM. 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 does not disturb a listener sitting in the meeting. Speed of sound in air is 320ms−1.

At a prayer meeting, the disciples sing JAI-RAM JALRAM. The sound ampl

1.	At a prayer meeting, the disciples sing JAI-RAM JALRAM. 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 does not disturb a listener sitting in the meeting. Speed of sound in air is 320ms−1.
Answer» At a prayer meeting, the disciples sing JAI-RAM JALRAM. 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 does not disturb a listener sitting in the meeting. Speed of sound in air is $320 m s^{- 1}$ .

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