Physics
WAEC 2018
In which of the following situations is photoelectric effect employed?
I. Automatic devices for switching on light at dusk
II. Automatic doors in departmental stores
III. Automatic devices for switching on air conditioners
IV. Automatic voltage stabilizers
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A.
I, II and IV only
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B.
I, III and IV only
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C.
III and IV only
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D.
I and II only
Correct Answer: Option A
Explanation
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