Which of the following transforms an energy resource into electrical energy, and is a technology with no negative environmental impacts?

i. a coal-fired power plant
ii. a solar cell
iii. a wind turbine
iv. a hydroelectric dam

a.
i and ii only
b.
none of these
c.
iv only
d.
ii and iii only

the answer is a. hope this .

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

i think the answer is a, hope this : )