The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the :
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Explanation:
Work function of a surface of a photosensitive material = 6.2 eV (Given)
Wavelength of the incident radiation = 5 V (Given)
According to the laws of the photoelectric effect -
Kemax = E − ϕ
where is the function and Kemax is the maximum kinetic energy of the photoelectron. Thus, -
= eV0=E−ϕ
= E=eV0+ϕ
= 5eV+6.2 eV
= 11.2 eV
= λ =(12400/11.2)A
=1000 A
Hence, the radiation lies in ultraviolet region.
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