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 \(50 \mathrm{~Hz}\) tone from a distant loudspeaker. How far from the wall must you move to find the first quiet spot? Assume a sound speed of \(340 \mathrm{~m} / \mathrm{s}\).