1.
The ultimate source of energy for the earth.
2.
The sun contains 19% of this element.
3.
The sun consists of 80% of this gas.
4.
Energy source of the sun is thermonuclear ______.
5.
Minutes it takes for sun energy to reach earth.
6.
Electromagnetic energy from the sun reaching Earth.
7.
Another word for irradiance.
8.
Produced by direct radiation reaching the ground.
9.
Radiation direction changed by scattering.
10.
Gas that absorbs UV radiation in the atmosphere.
11.
Gas that absorbs infrared energy along with water vapor.
12.
These reflect part of the radiation back into space.
13.
Particles that help scatter solar radiation.
14.
Most common semiconductor material for solar cells.
15.
Light particle that strikes a PV cell.
