Ultrasound of frequency 30 kHz has a wavelength of 0.011 m in air. State what is meant by 'frequency'.

1. (a)(i)Ultrasound of frequency 30 kHz has a wavelength of 0.011 m in air. State what is meant by 'frequency'.[1]
2. (a)(ii)Calculate the speed of ultrasound in air. Show your working. speed = ........................................................... m/s[2]
3. (a)(iii)State one use of ultrasound.[1]
4. (b)(i)Sound waves are longitudinal waves. Water waves are transverse waves. Describe, by referring to the movement of the particles in the wave, the difference between a longitudinal wave and a transverse wave. You may include a labelled diagram to help your description.[3]
5. (b)(ii)State one source of waves that generates both longitudinal and transverse waves.[1]
6. (c)Fig. 4.1 shows radio waves of long and short wavelength passing over the same hill. [Figure 4.1] Explain why the radio waves in diagram A reach the house but the radio waves in diagram B do not reach the house.[2]

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.