Find threshold wavelength given work function is 4.5ev
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The threshold wavelength is λ0 = 2958 A0.
Explanation:
In this case the threshold wavelength of photo electric effect of molybdenum is :
λ0 = hc / W0
λ0 = 6⋅626×10^−34 × 3×10^ 8 / 4⋅2 × 1⋅6×10^−19
λ0 =2⋅958×10^−7 m
λ0 =2958 A0
Hence the threshold wavelength is λ0 =2958 A0.
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