Quelpr
2 marksTransducers

CAPE Physics Unit 2 · 2018 · Paper 2 · Question 2(b)

Measurements of resistance and luminous intensity for an LDR are given in Table 2.

Complete Columns 3 and 4 of Table 2 (log₁₀ R and log₁₀ Iᵥ).

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)State the meaning of the acronym LDR, and briefly explain its operation.[4 marks]
  2. 2(c)On the grid provided in Figure 2, plot a graph of log₁₀ R against log₁₀ Iᵥ and draw the line of best fit through the points.[4 marks]
  3. 2(d)Use your graph from (c) to find the resistance of the LDR at a luminous intensity of 200 cd.[3 marks]
  4. 2(e)If the switching circuit turns on the floodlights whenever the voltage at its input falls below 7.5 volts, what should the value of R be?[2 marks]

More practice: the rest of this paper · more Transducers questions · all CAPE Physics Unit 2 past papers