If too much energy is given to an electron that is above the threshold frequency what happens to the extra energy?

Explanation:

Photons with a frequency greater than the threshold frequency have energy greater than the work function and electrons will be ejected. ... If the frequency is high enough, the energy is high enough and a photoelectron is emitted) than the metal's work function, the photoelectron would leave with some kinetic energy.

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The electron gives up It's extra energy in a form called "photon light" and falls back down to its normal energy level

Explanation:

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

see earlier answer