1) 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?

2) What is meant by the term wavefront?

3) 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

4) The diagram below shows the particles (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p and q) of a longitudinal progressive wave at a particular instance.

Which of the particles are at maximum displacement from their rest positions?

5) 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?