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3. A photocell generates electricity when it is exposed to light from the visible spectrum. The
voltage produced in the photocell varies with the intensity of the light source. A student
suggests that the voltage produced also varies with the colour of the light.
Assume that you are provided with the following apparatus
• Photocell
• Voltmeter
• Sheltered light intensity meter/photocell
• Selection of filters
• Light source of variable intensity
• Metre rule
Design an experiment to investigate the response of the photocell to the light of three
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different colours and the intensity of the light. Write your answers under the following headings.
(a) Identification of variables
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[2 marks]
(b) Set-up of apparatus
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[3 marks]
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