When monochromatic light of an unknown wavelength falls on a sample of zinc, a minimum potential of 2.21 V is required to stop all of the ejected photoelectrons. (The work function for zinc is 4.31 eV. Determine the maximum speed (m/s) and wavelength (nm).

What is the maximum velocity of a photoelectron emitted from a surface with work function 6.2 eV when illuminated by 181-nm ultraviolet light? ( m electron = 9.11 × 10 −31 kg, h = 6.63 × 10 −34 J ⋅s, 1 eV = 1.60 × 10 −19 J, and 1 nm = 10 −9 m)

For a certain metal, the threshold wavelength for the photoelectric effect is 664.0 nm. What is the maximum velocity (in m/s) for ejected electrons when light with wavelength 464.0 nm shines on the metal?

(a) A photoelectric experiment is performed where green light with a wavelength of 546.1 nm is shined on a metal plate, creating a photocurrent from it to a collector plate. When the potential difference between the metal plate and the collector is increased to a magnitude of 0.686 V, the photocurrent goes to zero—in other words, this is the stopping potential. What is the work function (in eV) for this metal? answer in eV (b) The experiment is performed again with the same metal, but now red light with a wavelength 650.0 nm is shined on it. What is the new stopping potential (in V) in this case? answer in V