1) The diagram below shows the position of a string at a particular instant of time as a progressive transverse wave travels along it from right to left.

Which one of the following correctly states the direction of motion (if any) of the points P, Q and R on the string at the instant shows?

2) The frequency of a wave is

3) The diagram shows the refraction of water waves in a ripple tank.

What is the change in the velocity and frequency as the water waves enter the shallow region?

4) Which of the following describes correctly the changes, if any, to the frequency, wavelength and speed of sound as it travels from air into water?

5) A progressive longitudinal wave is set up in a slinky spring. The diagram below shows the position of the spring at a particular instant of time.

The wavelength of the longitudinal wave is