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  4. Light of wavelength 4000 overset texto mathop textA is incident on a sodium surface for which the threshold wavelength of photoelectron is 5420 overset texto mathop textA . The work function of sodium is

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Q. Light of wavelength 4000 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ is incident on a sodium surface for which the threshold wavelength of photoelectron is 5420 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ . The work function of sodium is

CMC MedicalCMC Medical 2008

Solution:

$ {{W}_{0}}=\frac{12375}{{{\lambda }_{0}}(\overset{\text{o}}{\mathop{\text{A}}}\,)} $ $ =\frac{12375}{5420}=2.28\,\,eV $