Photoelectric Effect Module #28

[Heesu_Kim_1F]

28) Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 10^5 m s^-1. The work function for sodium is 150.6 kJ mol^-1.
A. What is the kinetic energy of the ejected electron?
I know that in order to find the kinetic energy, I need to use the (1/2) mv^2 equation. Velocity = 6.61 x 10^5 m s^-1 is given, but is the mass referring to the mass of electron = 9.11 x 10^-31 kg? And if so, is this a constant/number that I need to memorize?

[Samantha Man 1L]

Yes the mass is referring to that of an electron. I think we most likely won't have to memorize that value and it'll probably be given to us if needed on an exam.