The work function for tungsten is 4.58eV. What is the kinetic energy of electrons emitted when light of wavelength 400nm is incident on the tungsten surface? (Planck constant= 6.626 x10^-34 J s= 4.136 x10^-15 eVs)
A. 0.74eV
B.1.5eV
C. 7.7eV
D. 2.9eV
E. No electrons are emitted
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