What is the photoelectric effect?
A photocell is connected to a sensitive galvanometer as shown in the diagram - Leaving Cert Physics - Question c - 2008
Question c
What is the photoelectric effect?
A photocell is connected to a sensitive galvanometer as shown in the diagram. When light from the torch falls on the photocell, a ... show full transcript
Worked Solution & Example Answer:What is the photoelectric effect?
A photocell is connected to a sensitive galvanometer as shown in the diagram - Leaving Cert Physics - Question c - 2008
Step 1
Name the parts of the photocell labelled A and B.
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Answer
A = photo(-)cathode
B = photo(-)anode
Step 2
How can you vary the brightness of the light falling on the photocell?
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Answer
You can vary the brightness of the light falling on the photocell by:
Moving the light source closer or further away from the photocell.
Using a different torch with varying light intensity.
Step 3
How does the brightness of the light effect the current?
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The brightness of the light affects the current as follows: the greater the brightness, the greater the current detected. Conversely, if the brightness decreases, the current will also decrease.
Step 4
Give a use for a photocell.
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Answer
Photocells can be used in various applications such as:
Burglar alarms
Automatic door systems in heating systems
Streetlights
Solar cells
Sound track in film
Motion sensors for lighting
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