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CAIE A-Level Physics Graphs, Gradients, Intercepts and Areas

Practise selecting graph variables and scales, identifying graph forms, finding gradients, intercepts, intersections or tangents, and interpreting areas when the model supports…

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • choose variables and scales and determine gradients, intercepts or intersections from experimental graphs
  • draw and interpret straight-line or curved best-fit trends, including tangents and area under a curve where relevant

M.4-Graphs, gradients, intercepts and areas question 1

[Maximum number: 1]

A student determines the specific latent heat of vaporisation of a liquid using the apparatus illustrated in Fig. 3.1.

Fig. 3.1

Fig. 3.1

The heater is switched on. When the liquid is boiling at a constant rate, the balance reading is noted at 2.0 minute intervals.

After 10 minutes, the current in the heater is reduced and the balance readings are taken for a further 12 minutes.

The readings of the ammeter and of the voltmeter are given in Fig. 3.2.

Fig. 3.2

Fig. 3.2

The variation with time of the balance reading is shown in Fig. 3.3.
balance reading/g

Fig. 3.3

Fig. 3.3

From time 0 to time 10.0 minutes, the mass of liquid evaporated is 56 g .

Use Fig. 3.3 to determine the mass of liquid evaporated from time 12.0 minutes to time 22.0 minutes.

mass =g [1]
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