If the incoming photon had a frequency of 8.0 e14 hz, would you have a photo-electron ejected? yes no

Yes.

In fact, from the graph we see that the threshold frequency (the minimum energy of the incoming energy needed to extract a photoelectron from the material) is (we see it because this is the frequency at which the maximum kinetic energy of the emitted electron is zero).

The incoming photon in this problem has a frequency of 8.0 E14 Hz, so above the threshold frequency, therefore it is enough to extract photoelectrons from the material.

this means that the temperature of both substances will be equal

d is the correct answer