Physics (AS & A Level) · Oct / Nov 2016 · Paper 52 · Question 2
9702
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The question as text
A student is investigating the characteristics of different light-emitting diodes (LEDs). Each LED needs a minimum potential difference across it to emit light. The circuit is set up as shown in Fig. 2.1. V Fig. 2.1 The potentiometer is adjusted until the LED just emits light. The potential difference V across the LED is measured. The experiment is repeated for LEDs that emit light of different wavelength λ. It is suggested that V and λ are related by the equation V = pλq where p and q are constants.
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Show the answer and mark scheme
2(a)[1]
2(b)[3]
2(c)(i)[2]
2(c)(ii)[2]
Line of best fit drawn; not from top point to bottom point unless points are balanced. Upper end between (2.694, 0.55) and (2.700, 0.55), lower end between (2.770, 0.35) and (2.776, 0.35). (1)
Worst acceptable line: steepest or shallowest possible line through all the error bars. Mark scored only if all error bars are plotted. (1)
2(c)(iii)[2]
2(c)(iv)[2]
2(d)[2]
2(e)[1]
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