Crossword

2. Type of radiation with the highest frequency, highest energy, and shortest wavelength
8. used for long-distance telephone calls, signals for cables tv, weather forecast, and microwave
9. A lens that is thinner in the center than at the edges; diverging
10. of reflection angle between incident and normal
11. radiation with enough energy to KNOCK electrons off some atoms of a bombarded substance to • roduce ions
15. founder of modern physics; father of electromagnetic theory
17. highest point of a wave
18. range of electromagnetic signals encompassing all frequencies
19. that rebounds from the surface
20. Energy that is radiated or transmitted in the form of rays or waves or particles.

1. Electromagnetic radiation that can be seen with the unaided eye; traffic lights, car headlights, LCDs,surgery, biomedical, microscopyultraviolet radiation
3. wave A wave that needs a medium to travel through
4. a mirror with a flat surface
5. Hertz demonstrated the physical existence of radio waves in 1877
6. A lens that is thicker in the middle than at the edges; converging
7. waves second on the electromagnetic spectrum going from lowest to highest frequency. can be felt as heat. known as "below red"
12. when it is diverging, it is
13. cycle per second is the unit of
14. Electromagnetic radiation having a very short wavelength, can penetrate substances such as skin and muscle
16. any surface that is smooth enough to produce a regular reflection