Across
- 1. maximum frequency of infrared rays.
- 6. natural source/s of infrared radiation.
- 8. Radiant energy that is visible to the eyes but only is felt as heat.
- 9. even things like an ____ puts out some heat.
Down
- 2. a German-born British astronomer that discovered infrared radiation.
- 3. damage to the opacity of the lens can be seen in the _______ field.
- 4. infrared rays can promote local ____ circulation.
- 5. infrared radiation causes ____ warming.
- 7. infrared is used in ____ treatment.