H2P-601

Energy levels and line spectra

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

In a photocell experiment, light of wavelength 420 nm is incident on a metal surface. The work function of the metal is 2.1 eV. What is the maximum kinetic energy of the emitted photoelectrons?
(Take

h = 6.63\times10^{-34}

J s,

c = 3.0\times10^8

m s

^{-1}

e = 1.6\times10^{-19}

C.)

$1.38\times10^{-19}$ J
$3.36\times10^{-19}$ J
$4.74\times10^{-19}$ J
$7.10\times10^{-19}$ J

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