In which of the following situations is photoel... - WAEC Physics 2018 Question
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
A
I, II and IV only
B
I, III and IV only
C
III and IV only
D
I and II only
correct option: a
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