Question

When light of wavelength 300.0 nm is incident on potassium, the emitted electrons
have maximum kinetic energy of 2.03 eV.

A) Calculate the work function for potassium.

B) Calculate the stopping potential if the incident light, instead, has a wavelength of 400.0 nm.

C) Now, assume that the incident light has an intensity of 0.01 W/m^2, and that the potassium atom has an area of 0.01 nm^2. Using classical physics, estimate the time required for an energy equal to the work function to fall on the atom. Explain.

Answer 1

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