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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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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:
A. 540 nm
B. 400 nm
C. 310 nm
D. 220 nm
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Correct Answer - C
Threshold wavelength, `lamda_(0)=(hc)/(W_(0))=(12400)/(4)=3100`Å
=310 nm
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