Physics 10 Section 4

4. By definition if we can see it it is _____!
6. Water is a(n) ________while hydrogen and oxygen are atoms
8. Found in the nucleus or atom
12. A phenomenon in which two waves superimpose to form a resultant wave of greater or lower amplitude
16. The most spectacular effect of waves is ______ where a wave is reflected back and forth and driven at the proper frequency
18. A unit of length equal to 0.1 nm
19. the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon
20. If electrons could spin up, down, and sideways there would be more _____ in the periodic table

1. A disturbance or oscillation that travels through space and matter, accompanied by a transfer of energy
2. Refers to various phenomena which occur when a wave encounters an obstacle
3. A(n) _____ is sometimes pictured as being like a solar system
5. The “size” of the wave, for water waves this would be how high the wave goes above still water
7. Bees can see ______(kind of light), but people can’t
9. Has a negative charge
10. Equals to Power over Area
11. The number of peaks that go by in a second, or cycles per second
13. _____= frequency x wave length
14. _____are antimatter electrons! Medically they are used for detecting cancer etc. in somewhat the same way as other nuclear decays
15. ______ diameter = about two Angstroms or 0.2 nm
17. _____ rays are a combination of two protons and two neutrons, a He4 nucleus