Physics > 2018 > 47
WASSCE
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 stabilization
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 stabilization
A.
I, II and IV only
B.
I, III and IV only
C.
III and IV only
D.
I and II only
Answer: B
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