Fig. 10.1 shows two rays from an object that is placed in front of a plane mirror. [Figure 10.1]

1. (a)(i)On Fig. 10.1, draw the two reflected rays and locate the position of the image.[2]
2. (a)(ii)Apart from its position, state one characteristic of the image.[1]
3. (b)(i)Fig. 10.2 shows wavefronts in a ripple tank. They move in the direction of the arrow. The wave hits the boundary between two regions and the wave slows down as it enters the shaded region. [Figure 10.2] State what is meant by wavefront.[2]
4. (b)(ii)1.Both reflection and refraction occur at the boundary. On Fig. 10.2, draw the reflected wavefronts.[1]
5. (b)(ii)2.On Fig. 10.2, draw the refracted wavefronts.[2]
6. (c)(i)A loudspeaker produces a sound of frequency 2.0 kHz. The wavelength of this sound in air is 16 cm. Calculate the speed of sound in air.[2]
7. (c)(ii)1.State the range of frequencies that can be heard by a healthy human ear.[1]
8. (c)(ii)2.Calculate the smallest wavelength of sound that can be heard by a healthy human ear.[1]
9. (c)(iii)Describe a simple experiment to show that sound waves obey the law of reflection. You may draw a diagram if you wish.[3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.