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  4. Assertion: Photosensitivity of a metal is high if its work function is small Reason: Work function =h upsilon0 where upsilon0 is the threshold frequency

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Q. Assertion : Photosensitivity of a metal is high if its work function is small
Reason: Work function $=h\upsilon_{0}$ where $\upsilon_{0}$ is the threshold frequency

Dual Nature of Radiation and Matter

Solution:

Work function is the minimum energy required to eject the photoelectron from photosensitive metal. Hence for metal to be photosensitive, the work function should be small
Work function $=h\upsilon_{0}$, where $\upsilon_{0}$ is the threshold frequency