a ‘pulse’ that travels through a material, caused by forward and backward vibrations of particles

sound waves with a frequency above 20 000 Hz, that cannot be detected by human ears

a group of living cells that are similar and perform a specific function

Ultrasound

Science

In the Measuring waves unit, pupils will build on this knowledge to learn about the measurable features of a wave, the relationship between them and the wave equation.

In the Making images unit, pupils learnt that white light is made of different colours that can be detected by the eye, and how pinhole cameras and lenses form clear images.

Waves

Ultrasound means sound waves with frequencies above…

How many of the following materials can ultrasound waves travel through? air, water, soft tissue in the body.

Ultrasound waves cannot fit into the ear canal.

Parts of the human ear cannot vibrate fast enough.

The brain cannot recognise nerve signals caused by ultrasound.

Which of the following explains why humans cannot hear ultrasound?

Which of the following increases the rate of energy transfer by a sound wave or ultrasound wave?

It can be used to see inside body tissues.

Which of the following describes how ultrasound can be useful in physiotherapy?

It reflects off boundaries between different tissues.

Which of the following statements explain why ultrasound can be used to look inside the human body?

Which of the following are transferred by a sound wave?

When a material allows a wave to travel through it, we say that the material __________ the wave.

Which of the following is the frequency of a wave?

Which of the following is the unit of frequency?

Ultrasound waves have the same frequency as sound waves.

Ultrasound waves have lower frequencies than sound waves.

Ultrasound waves have higher frequencies than sound waves.

Which of the following statements about ultrasound waves is correct?

contains liquid, and hair cells that can produce nerve signals

Match each of the following parts of the human ear with its function.

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