In order for plants to go through photosynthesis, they must use a. x rays. b. visible light. c. infrared rays. d. ultraviolet light.

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?