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The work function for aluminum is 4.2 eV. (a) What is the cutoff frequency of light...

The work function for aluminum is 4.2 eV. (a) What is the cutoff frequency of light
incident on an aluminum target that releases photoelectrons from its surface? (b) Find the
corresponding cutoff wavelength. (c) If photons of energy 5.5 eV are incident on an
aluminum target what is the maximum kinetic energy of the ejected photoelectrons? (d)
what is the maximum velocity of a photoelectron traveling from the anode to the cathode
of a photocell? (d) If a red laser beam with � = 640 nm hits the aluminum target, what
will be the kinetic energy of the emitted photoelectrons?

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