Just as the ball begins to touch the first speck of dust on the ground,
its kinetic energy is 49 joules and its potential energy is zero.
It would be easier to answer if there was a graph, but I think its <u><em>A </em></u><em> </em>I could be wrong :/
Answer:
Positive.
Explanation:
As a consequence of the photoelectric effect, electrons that will get hit by sufficiently energetic photons will abandon the metal surfaces exposed to bright sunlight. This decreases the negative charge of the surface, thus causing it to develop a positive net charge.
Answer:
Visible, or infrared lights
I did some searching on google and from what i read all but MILLIGRAM measure volume
