Work Function

[Reese - Dis 1G]

How do you find the work function given only the frequency? In the example I have the frequency is 4.50 x 10^16 Hz.

[Jerome Mercado 2J]

If the frequency is considered to be the amount of which where an electron is taken off the surface of the metal, the work function is the same as the energy of a photon that is needed to remove the electron. Thus the equation is also E(work) = hv.

Note that photon to electron ratio is 1:1.

[Jonas Talandis]

Substitute known values into equations. If the Frequency of the photon is known, it can be multiplied by Plank's Constant (h) to find the energy of the photon in J. Then, we know the Kinetic Energy of the resulting emitted electron to be equal to 1/2*m*v^2. The mass of the electron is known but the velocity of the electron is necessary to find the Work Function in E(photon)-Work=1/2*m*v^2. However, if the Energy of the photon is assumed to be exactly equal to the Work Function, it would just be equal to the energy of the photon = h*V.