science crossword

3. how many motions that happen in a period of time
4. a incoming ray
7. a material that allows light to pass through it
9. the distance from trough to trough or crest to crest
12. an extent of frequencies of a given type of radiation
14. a ray that bounces off a barrier
16. a material that most lights get through but are scattered in every direction
18. a material that prevents light from passing through it
19. a pull or push motion on an object
20. a more powerful type of electromagnetic radiation

1. a type of electromagnetic radiation that has the lowest energy and frequency and longest wavelength
2. the type of wave that moves up and down
5. stands for radio detecting and ranging
6. a type of wave that transfers energy
8. you can look at yourself in this object
10. what its called when a wave bends and passes material
11. the height of a wave
13. the highest point in a wave
15. the lowest point in a wave
17. you can use a ray model to predict where shadows will be