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In the photoelectric effect, the minimum frequency for electrons to be emitted from a surface is 4.5 x 1014 Hz.

Q. Now light with wavelength 420 nm was directed unto the metal. What is the KE of the emitted electrons?

(a) 0.79 eV

(b) 1.09 eV

(d) 2.11 eV

(e) 2.67 eV

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