Ripple tanks are often used to illustrate wave motion.

1. (a)Describe what is meant by wave motion in a ripple tank.[2]
2. (b)(i)When describing wave motion, state what is meant by frequency,[1]
3. (b)(ii)wavelength.[2]
4. (c)A water wave in a ripple tank strikes a barrier. Fig. 4.1 shows some wavefronts of the incident wave. [Figure 4.1] The water wave hits the barrier and is reflected. Three of the wavefronts in Fig. 4.1 have already hit the barrier. The reflected parts of these wavefronts are not shown. On Fig. 4.1, draw the reflected parts of these three wavefronts.[3]

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