physics

5. Particles of a medium vibrate perpendicularly to the direction of the motion of the wave.
7. When the frequency of an external force matches the natural frequency of the body then the body oscillates with large amplitude.
8. The maximum distance that particles of a wave’s medium vibrate from their rest position
10. Any of the particles from outer space that are continuously colliding with the Earth's atmosphere. They are mostly protons
12. Elements that have properties between those of a metal and those of a nonmetal
14. An instrument that measures atmospheric pressure, used in weather forecasting and in determining elevation above sea level
15. A small packet of light energy
16. After gamma waves, what is the second most dangerous type of wave on the spectrum?

1. Resistance to motion due to one object rubbing against another
2. A cylindrical coil of wire that becomes electromagnetic when a current runs through it
3. A machine that converts mechanical energy into electrical energy
4. The unit of work
6. The rate at which velocity changes
9. The remaining core of a supernova that is so dense that even light cannot escape.
11. A collective name for protons and neutrons
13. Unit of power of a lens
15. A highly ionized gas composed entirely of equal number of positive ions and electrons.