H2P-603

Energy levels and line spectra

H2 Physics · JC 2 · Medium · Energy levels and line spectra

A metal has work function 2.8 eV. Monochromatic light of wavelength 350 nm is incident on it. What is the stopping potential required to just stop the most energetic photoelectrons?
(Take

h = 6.63\times10^{-34}

J s,

c = 3.0\times10^8

m s

^{-1}

e = 1.6\times10^{-19}

C.)

0.75 V
1.2 V
2.8 V
4.5 V

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