| Answer | Crossword Clue |
|---|---|
| PHOTON | Quantum of radiant energy. |
| ACTINISM | Property of radiant energy. |
| ACTINISM | Property of radiant energy |
| SPECTRO | Of radiant energy: Comb. form. |
| RADIOMETER | It measures intensity of radiant energy. |
| THERMOPILE | Radiant energy measurer |
| FLUORESCES | Glows with radiant energy |
| EMITTANCE | Ability to give off radiant energy |
