Light of wave length 5000 Angstrom falls on a sensitive plate with photoelectric work function of 1.9 eV. The maximum kinetic energy of the photo electron emitted will be..
1.16 eV
2.38 eV
0.58 eV
2.98 ev
A
0.58 eV
B
2.98 ev
C
1.16 eV
D
2.38 eV
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Solution
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Work function of plate ϕ=1.9eV Wavelength of incident photon λ=5000Ao=500nm Energy of the incident photon Eincident=1240λ(innm)eV ⟹Eincident=1240500=2.48eV Maximum kinetic energy of photon emitted K.Emax=Eincident−ϕ ⟹K.Emax=2.48−1.9=0.58eV
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