What is the work function of the experimental photo-missive material? 0.50 ev -2.9 ev -1.2 ev -2.0 ev

The answer for this exercise is the last option, which is:

The explanation is shown below:

1. The graph shows the Photoelectric effect, which is defined as the ejection of electrons from a solid, this is caused by the incident of ligth. The maximum kinetic energy depends of the frequency of this ligth.

2. You must find the the graph shown in the figure attached to solve the exercise:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

i think the answer would be reserve.