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The sodium cathode of a photocell is irradiated with ultraviolet light as shown in the diagram below. The ammeter registers a current.
Which ONE of the following changes will INCREASE the ammeter reading?
A Use a thinner sodium cathode.
B Increase the intensity of the ultraviolet light.
C Increase the frequency of the ultraviolet light.
D Replace the sodium cathode with a cathode of lower work function.
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