The work function for silver is4.26 eV. (a) Convert the value of the work functi

Question

The work function for silver is4.26 eV. (a) Convert the value of the work function fromelectron volts to joules.
1 J

(b) Find the cutoff frequency for silver.
2 Hz

(c) What maximum wavelength of light incident on silver releases photoelectrons from thesilver's surface?
3 m

(d) If light of energy 7.2 eV isincident on silver, what is themaximum kinetic energy of the ejected photoelectrons? Give theanswer in electron volts.
4 eV

(e) For photons of energy 7.2 eV, whatstopping potential would be required to arrest the current ofphotoelectrons?
5 V (a) Convert the value of the work function fromelectron volts to joules.
1 J

(b) Find the cutoff frequency for silver.
2 Hz

(c) What maximum wavelength of light incident on silver releases photoelectrons from thesilver's surface?
3 m

(d) If light of energy 7.2 eV isincident on silver, what is themaximum kinetic energy of the ejected photoelectrons? Give theanswer in electron volts.
4 eV

(e) For photons of energy 7.2 eV, whatstopping potential would be required to arrest the current ofphotoelectrons?
5 V

Explanation / Answer

work function W = 4.26 e V                           = 4.26 * 1.6 * 10 ^ -19 J (b). cutoff frequency f = W / h where h = planck's constant = 6.625 * 10 ^ -34 J s (c). maximum wavelength = c / f where c = speed of light = 3 * 10 ^ 8 m / s (d). maximum kinetic energy K = E - W where E = energy = 7.2 e V             W= 4.26 eV (e). 7.2 - 4.26 = 2.94 V .

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