Question

1. [1pt]
Consider standing sound waves in a tube. Answer true (T) or false (F) to the following statements; e.g., enter FFF.

1. 
   
2. The highest pressure and lowest pressure in the standing wave both occur where the particle displacement is the smallest.
3. The frequency of the standing wave increases as the harmonic mode increases.
4. For a pipe closed at one end, the pressure varies more at the closed end than at the open end.

Answer 1

FTT

The points where displacement is zero are called nodes and the points where the displacement is maximum are called antinodes.

Pressure changes are maximum at nodes and minimum at antinodes

For closed tubes, the air pressure at the closed end varies since it does not need to equalize with the atmosphere. The pressure at the open end is constant, so thepressure wave has a node at the open end and an antinode at the closed end.