### Practice Problem

Posted:

**Sun Apr 15, 2018 3:51 pm**Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 10^5 m/s. The work function for sodium is 150.6 kJ/mol.

A. What is the kinetic energy of the ejected electron?

For this problem, I want to use the equation E(k)=(1/2)(m(e-))(v(e-)^2) to find kinetic energy. The velocity, but not the mass, of the electron is given. How should I go about solving this?

A. What is the kinetic energy of the ejected electron?

For this problem, I want to use the equation E(k)=(1/2)(m(e-))(v(e-)^2) to find kinetic energy. The velocity, but not the mass, of the electron is given. How should I go about solving this?