Calculate the kinetic energy of an electron (in J) that is ejected from the sodium by light with a wavelength of 340 nm? Electrons are ejected from the sodium metal by any light that has a wavelength shorter than 544 nm.
The charge of an electron is - 1.602 x 10-19 C. Determine the numbers of microamperes (1 A = 1 C/s) of electrical current are formed by a photoelectric cell that is bombarded by the 5.90x1013photons each second? Suppose the photons have sufficient energy to eject the electrons. In this case, each photon ejects one electron.)