WAEC Physics
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 stores
IV. Automatic voltage stabilization
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 stores
IV. Automatic voltage stabilization
a.
I, II and IV only
b.
I, II and IV only
c.
III, IV only
d.
I and II only
No Answer Submitted
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