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in Physics by (70.7k points)

The ‘stopping potential’, needed to reduce the ‘photocurrent’ to zero, in a given set up, is 1.99 V. The given ‘set–up’, has a photosensitive surface being irradiated by a monochromatic radiation of wavelength 5000 Å. The treshoold frequency, for the given photosensitive surface, is (nearly)

(1) 2.4×1015 Hz

(2) 1.2×1015 Hz

(3) 6×1014 Hz 

(4) 3×1014 Hz

1 Answer

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Best answer

Correct option : (2) 1.2×1015 Hz

Explanation :

Energy of a photon, of the incident radiation,

Let W be the work function of the given photosensitive surface. We then have W = 2.49 eV – 1.99 eV = 0.5 eV

∴ If v0 is the threshold frequency, we have hv0 = W = 0.5 ×1.6×10–19 J

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