I need help with physics true and false questions!?

1. in the late 1800's. physicists believed that in order to ultimately describe nature they only needed to fine-tune their description of the order world
 
2. the energy of an emitted photoelectron increases with the increasing intensity of light.

3. light shining on a metal surface can cause electrons to be emitted.

4. as the frequency of the light increases, the maximum energy of a photoelectron increases.

5. the wave theory of light is used to explain the photoelectric effect.

6. the energy of electrons hitting a metal surface can produce electromagnetic radiation.

7.the chemical industry needs coal and oil for the production of aspirin, nylon, dyes, and plastics.

1. I don't really know what that means.
2. False
3. True
4. True
5. False
6. True
7. I don't know.