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0.10 eV photoelectrons are ejected from a piece of calcium whose work function is 2.71 eV...

0.10 eV photoelectrons are ejected from a piece of calcium whose work function is 2.71 eV when it is illuminated with a certain laser. What wavelength of light is the laser emitting? What region of the electromagnetic spectrum is this light is?

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Answer #1

kinetic energy of the emitted electrons = 0.10eV

Work function of calcium Wo=2.71eV

using the equation of conservation of energy,

  

The light is from the visible region of the electromagnetic spectrum.

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