Edexcel Gcse Physics/additional Science - Unit 2: Physics For Your Future Higher Tier Page 33
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*(d) A teacher decides to model how a machine checks
the level of the liquid in medicine bottles.
The machine uses a radioactive source to sound
an alarm when the level of liquid becomes too low.
He sets up the arrangement shown.
sensor which reacts
to the amount of
light reaching it
lamp
to circuit
card moves
card
The piece of card can be moved up and down
between the lamp and the detector.
Each part of the teacher’s arrangement
corresponds to a part of the machine.
By comparing the parts of the teacher’s
arrangement to the parts of the machine, discuss
how effective this model is. (6 marks)
(Begin your answer on next page)
(Turn over)
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