1) Where, in a standing wave, do the vibrations of the medium occur?

2) The diagram shows a stationary wave on a string at two instants of maximum vertical displacement.

The frequency of the wave is 12 Hz.

What is the speed of the wave?

3) A stationary longitudinal wave is set up in a pipe.

In the diagrams below, the length of each arrow represents the amplitude of the motion of the air molecules, and the arrow head shows the direction of motion at a particular instant.

Which diagram shows a stationary wave in which there are two nodes and two antinodes?

4) A stationary wave is produced by two loudspeakers emitting sound of the same frequency.

When a microphone is moved between X and Y, a distance of 1.5 m, six nodes and seven antinodes are detected.

What is the wavelength of the sound?

5) Source S emits microwaves with constant amplitude. The microwaves hit a metal screen P and are reflected. A stationary wave is formed between S and P. The wavelength of the microwaves is much smaller than the distance between S and P.

A detector Q is moved at a slow, constant speed from S to P.

What happens to the amplitude of the signal detected by Q?