2.51 The work function for caesium atom is 1.9 eV. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron.
Finding the kinetic energy of the ejected electrons:
K.E of the ejected photoelectron:
Finding the Velocity of the ejected electrons:
= mass of electron
= velocity of electron
Therefore, the velocity is given by,
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