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A particular metal illuminated by a monochromatic light source at 1.5 times the cutoff frequency fc...

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Physics

A particular metal illuminated by a monochromatic light sourceat 1.5 times the cutoff frequency fc (in an evacuatedchamber) emits photoelectrons with a maximum kinetic energy(Kmax) = 1.45 eV. For reference, Planck’s constant is4.136 x 10-15 eV·s, 1 nm = 10-9 m, 1 eV =1.60 x 10-19 J, and the speed of light is 3.00 x108 m/s.

(a) What is the work function (Φ) of this metal in eV? Enteryour answer in the box.

(b) What is the cutoff wavelength λ c for this metal (innm)?

(c) What is the maximum kinetic energy (Kmax, in eV)of a photoelectron emitted when the metal is illuminated by photonsof frequency 3 times fc?

(d) If the metal is illuminated by light from the hydrogen atomspectrum at λ= 411 nm, what is the maximum kinetic energy(Kmax, in eV) of a photoelectron emitted by themetal?  If no photoelectron is emitted, enter 0 for ananswer.

(e) If the metal is illuminated by light from the hydrogen atomspectrum at λ= 121.7 nm, what is the maximum kinetic energy(Kmax, in eV) of a photoelectron emitted by themetal?  If no photoelectron is emitted, enter 0 for ananswer.

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