9702/41/M/J/24 · question 1 of 1 in this topic

Question 2

2(a)(i)1 mark

State the magnitude and unit of absolute zero on the thermodynamic temperature scale.

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

Your answer

Suggested time: 2 min

2(a)(ii)1 mark

Explain why temperature measured using a laboratory liquid-in-glass thermometer does not give a measurement of thermodynamic temperature.

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

Your answer

Suggested time: 2 min

2(b)(i)2 marks

Fig. 2.1 shows a simplified diagram of a type of thermometer called a platinum resistance thermometer. The glass tube is immersed in the environment for which the temperature is to be determined. The resistance between the terminals X and Y is measured. Fig. 2.2 shows the variation of the resistivity ρ of platinum with thermodynamic temperature T.

Explain how Fig. 2.2 shows that platinum is a suitable metal for use in a resistance thermometer.

Fig. 2.1 — see the question text for what it shows

Fig. 2.2 — see the question text for what it shows

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

Your answer

Suggested time: 3 min

2(b)(ii)1 mark

A platinum resistance thermometer consists of a platinum wire wound on a plastic strip inside a large glass tube, which is immersed in the environment whose temperature is to be determined .

Suggest a reason why a platinum resistance thermometer is not suitable for measuring a rapidly changing temperature.

Suggest More than one answer may be acceptable, so long as it is consistent with the physics.

Your answer

Suggested time: 2 min

2(b)(iii)1 mark

Suggest a type of thermometer that is suitable for measuring a rapidly changing temperature.

Suggest More than one answer may be acceptable, so long as it is consistent with the physics.

Your answer

Suggested time: 2 min

2(c)1 mark

A negative temperature coefficient thermistor may be used as a type of resistance thermometer.

State one way in which the variation with temperature of the resistance of a thermistor differs from that of a platinum wire.

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

Your answer

Suggested time: 2 min

9702/41/M/J/24Cambridge International AS & A Level Physics 9702 · May/June 2024 · Paper 4 variant 1 · sit the whole paper