Practice: A metal with a threshold frequency of 2.15 x 10^{1}^{5} s^{-1} emits an electron with a velocity of 7.03 x 10^{6} m/s when radiation of 1.88 x 10^{15} s^{-1} strikes the metal’s surface. Calculate the mass of the electron.

What happens when light strikes the surface of a metal? The **Photoelectric Effect **can help to explain that.

Concept #1: Photoelectric Effect

Concept #2: Photoelectric Effect Formula

Example #1: The binding energy of electrons on a metal surface are 7.15 x 10^{-19} J. If an outside energy source with 4.33 x 10^{-17} J strikes the metal surface, what would be the kinetic energy of an ejected electron?

Concept #3: Photoelectric Effect Formula Expanded

Example #2: When the surface of metal is exposed to photons at a frequency of 7.13 x 10^{16} s^{-1}, electrons are emitted with a maximum kinetic energy of 6.30 x 10^{-19} J. Calculate the work function of the metal.

Practice: A metal with a threshold frequency of 2.15 x 10^{1}^{5} s^{-1} emits an electron with a velocity of 7.03 x 10^{6} m/s when radiation of 1.88 x 10^{15} s^{-1} strikes the metal’s surface. Calculate the mass of the electron.

Practice: An ultraviolet photon with a wavelength of 320 nm strikes a metal surface. The emitted electron has a kinetic energy of 1030 eV. What is the binding energy of the electron in kJ/mol? 1 electron volt (eV) = 1.602 x 10^{-19} J.