00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| any of the energy levels of a physical system, such as an atom or molecule, that has higher energy than the lowest energy level |
| any two masses attract each other with a force equal to a constant, multiplied by the product of the two masses, divided by the square of the distance between them |