Ultrasound waves can be used to create an image of part of the inside of a body.
Ultrasound waves have a higher frequency than ripples on the surface of water.
Describe another difference between ultrasound waves and ripples on the surface of water.
Explain your answer.
The graph in Fig. 19.1 shows how displacement of the ultrasound wave varies with distance.
Fig. 19.1
Wavelength = ....................................................... m [1]
Calculate the frequency of the ultrasound wave in Fig. 19.1.
Use the equation: wave speed = frequency × wavelength
Give your answer in standard form and to 2 significant figures.
Frequency = ..................................................... Hz [4]
Doctors can use an ultrasound scan to measure the size of a person’s kidney.
Fig. 19.2
Complete the sentences using the words below.
Each word may be used once, more than once, or not at all.
| Increases | Decreases | Stays the same |
The ultrasound scanner is made from a solid ceramic material.
As the wave enters the body, the speed ................................................. .
As the wave enters the body, the frequency ........................................... .
[2]
Explain how ultrasound waves are used to measure w.
[2]
A doctor uses an ultrasound scan instead of X-rays to measure the kidneys.
Explain why.
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She makes measurements of the water waves.
The Mexican wave continues by people, next to them, lifting and lowering their arms.
