Question 7

7(a)1 mark

State a typical value for the speed of sound in air.

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

Your answer

Suggested time: 2 min

7(b)2 marks

A sound wave in air has a wavelength of 22 mm.

Using your value for the speed of sound in air, calculate the frequency of the sound wave.

Using You must use the thing it names. An answer that reaches the right value another way may not score.

Your answer

Suggested time: 3 min

7(c)4 marks

Fig. 7.1 shows a solid block made from hot liquid metal. As the liquid cooled, a bubble formed inside the block. The bubble is not visible from outside the block.

Describe and explain how to use ultrasound to determine the size and position of the bubble inside the metal block. You may draw on the diagram.

Fig. 7.1 — see the question text for what it shows

Describe Say what happens, in order. Reasons are not required unless the question also asks why.

Your answer

Suggested time: 6 min

0625/04/SP/23Cambridge IGCSE Physics 0625 · Specimen 2023 · Paper 4 · sit the whole paper