Water waves are transverse waves.

1. (a)Underline two other examples of transverse waves. seismic P-waves seismic S-waves sound X-rays[1]
2. (b)(i)Fig. 5.1 shows a wooden bar and a glass block in a ripple tank. The depth of water in the tank is less than the height of the glass block. [Figure 5.1] The wooden bar moves up and down once every 0.15s to create the crests. The speed of the water wave is 27cm/s. Calculate the frequency and the wavelength of the wave. frequency = ................................................. Hz wavelength = ................................................. cm[3]
3. (b)(ii)The wave diffracts at the right-hand edge of the glass block. On Fig. 5.1 draw two crests after they pass the glass block to show the diffraction.[2]
4. (b)(iii)Describe how a wave with a smaller wavelength is made with the wooden bar.[1]
5. (b)(iv)Describe how a decrease in wavelength affects the diffraction.[1]