Light of wavelength 200.0 nm is incident on a metal plate with a threshold wavelength of 400.0 nm. what is the energy of the incident photon in electron volts?
a.
2.48 × 105 ev
c.
6.20 ev
b.
0.161 ev
d.
3.10 ev

Which of the following is not a result when a change to an equilibrium system is applied? (2 points) increasing the rate of the forward reaction will cause a shift to the left. increasing the rate of the reverse reaction will cause a shift to the left. decreasing the rate of the forward reaction will cause a shift to the left. decreasing the rate of the reverse reaction will cause a shift to the right.