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Question

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photo electron emission from this substance is approximately :
  1. 540 nm
  2. 220 nm
  3. 310 nm
  4. 440 nm

A
220 nm
B
310 nm
C
540 nm
D
440 nm
Solution
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W0=hv0=hcλ0
Work function in electron volt is 4 eV
W0=12400λ0=eV
40=12400λ0 λ0=310nm

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