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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

310 nm

b

400 nm

c

220 nm

d

540 nm

answer is C.

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Detailed Solution

λin Å=12375W (eV)           =123754.0Å≈3093Å          λ≈309.3 nm            ≈310 nm
NOTE    λin Å=12375W eV comes from W=hcλ

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