Modern Physics 2 Question 19

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

(1998,2M)

(a) 540nm

(b) 400nm

(c) 310nm

(d) 220nm

Show Answer

Solution:

  1. λ( in \AA)=12375W(eV)=123754.0\AA≈3093\AA

or λ≈309.3nm≈310nm

NOTE λ( in \AA)=12375W(eV) comes from W=hcλ

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