Question

When a sound wave travels directly toward a hard wall, the incoming and reflected waves can combine to produce a standing wave. There is an antinode right at the wall, just as at the end of a closed tube, so the sound near the wall is loud. You are standing beside a brick wall listening to a 85 Hz tone from a distant loudspeaker.

Part A How far from the wall must you move to find the first quiet spot? Assume a sound speed of 340 m/s.

Answer 1