Here\'s the entire question: When monochromatic ultraviolet light that has a wav
ID: 1726731 • Letter: H
Question
Here's the entire question:
When monochromatic ultraviolet light that has a wavelengthequal to 120 nm is incident on a sample of a certain metal, theemitted electrons have maximum kinetic energy of 5.83 eV. (a) What is the energy of an incident photon?
(b) What is the work function for the metal?
(c) What would be the maximum kinetic energy of the electronsif the incident light had a wavelength of 220 nm?
(d) What is the maximum wavelength of incident electromagneticradiation that will result in the photoelectric emission ofelectrons by a sample of this metal? (answer in nm) Again, the above equationdoesn't work.
I appreciate any help.
Explanation / Answer
(c) Work function, = 4.47 ev Wavelength of incident light, = 220 nm =2200 Ao Energy of incident photon, E = h c / = [ 12400 / ( in Ao) ] ev = 12400 / 2200 = 5.64 ev Maximum kinetic energy, Kmax = E - = 5.64 - 4.47 = 1.17 ev (d) Threshold wavelength , o = 12400 / = 12400 / 4.47 = 2774 Ao = 277.4 nm Maximum wavelength of incident electromagneticradiation that will result in the photoelectric emission = 277.4nm