### Question 1.33, part b

Posted:

**Thu Apr 26, 2018 5:22 pm**The velocity of an electron that is emitted from a metallic surface by a photon is 3.6x10^3 km/s. No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50x10^16Hz. How much energy is required to remove the electron from the metal?

I know you eventually have to find the work function by subtracting kinetic energy of the electron (which I have calculated from the velocity) from the E of the photon but how do you get the other two values. I also have the wavelength from part a.

I know you eventually have to find the work function by subtracting kinetic energy of the electron (which I have calculated from the velocity) from the E of the photon but how do you get the other two values. I also have the wavelength from part a.