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Q.

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately:

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a

540 nm

b

310 nm

c

400 nm

d

220 nm

answer is C.

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Detailed Solution

λmax=hcW0=6.626×10-34×3×1084.0×1.6×10-19=3.10×10-7 m.

=310 nm 

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