Question

We

describe sound waves in terms of pressure. Given this,
for a standing wave in a tube open at each end, the open
ends of the tube are?

Answer 1

For a standing wave in a tube open at each end, the open ends of the tube are points of maximum displacement and minimum pressure. At these points, the air molecules in the tube are free to move back and forth, causing the pressure to vary periodically between maximum and minimum values. The points of maximum displacement are called antinodes, while the points of minimum displacement are called nodes. In the case of a tube open at each end, the open ends act as antinodes, since the air molecules at these points are free to move.