Photoelectric Effect difficulties

[ysidfa]

Homework Statement

"The threshold frequency of a particular metal surface is 5.6 × 10¹⁴ Hz. Calculate the maximum kinetic energy of emitted electrons if the frequency of the light striking the metal surface is double the threshold frequency."
Taken from AQA Physics Exam 2009

Homework Equations

E=hv, W=hF_o

The Attempt at a Solution

I tried working out double the threshold freq. and then going into finding the KE_max from there. Got Really confuzed... :(

 

[Andrew Mason]

Homework Statement

"The threshold frequency of a particular metal surface is 5.6 × 10¹⁴ Hz. Calculate the maximum kinetic energy of emitted electrons if the frequency of the light striking the metal surface is double the threshold frequency."
Taken from AQA Physics Exam 2009

Homework Equations

E=hv, W=hF_o

The Attempt at a Solution

I tried working out double the threshold freq. and then going into finding the KE_max from there. Got Really confuzed... :(

Assume the photon with double the threshold frequency gives all its energy to the electron. How much is used in freeing the electron from the surface? What happens to the rest of the energy?

AM