1. The work function of potassium is 3.68 × 10 -19 J. (a) What is the minimum frequency of light 
   needed to eject electrons from the metal? (b) Calculate the kinetic energy of the ejected 
   electrons when light of frequency equal to 8.62 × 10 15 s
   -1 is used for irradiation.

The work function of potassium is 3.68*10^-19 J. a) What is theminimum frequency of light needed to efect electrons from themetal? b) calculate the kinetic energy of the ejected electronswhen light of frequency equal to 8.62*10^14 s^-1 is used forirradiation.

The work function, W, of cesium metal is 3.43 x 10^-19 J. Calculate the kinetic energy of the ejected electron if light of frequency 2.25 x 10^15 is used for irradiating the metal.