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When a certain photosensitive surface is illuminated with monochromatic light of frequency f, the stopping potential for the photocurrent is (-V0/2). When the surface is

When a certain photosensitive surface is illuminated with monochromatic light of frequency f, the stopping potential for the photocurrent is (-V0/2). When the surface is illuminated by monochromatic light of frequency f/2, the stopping potential is –V0. The threshold frequency for photoelectric emission is


(a) 4f/3


(b) 2f


(c) 5f/3


(d) 3f/2

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