Physics

3. the rate of increase of speed or the rate of change of velocity
5. A stellar explosion, which is more energetic than a nova
9. any phenomenon associated with stationary or moving electrons, ions, or other charged particles
11. a flow of electric charge through a conductor
12. a measure of this capacity
13. The point on a wave with the maximum value
15. the tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force
19. substance that occupies space and has mass, as distinguished from substance that is mental, spiritual, etc
20. a substance, body, or system that conducts electricity, heat, etc

1. a unit for comparing two currents, voltages, or power levels
2. A region of space-time, which gravity is very powerful and prevents anything, including light, from escaping
4. the distance, measured in the direction of propagation
6. It is an elementary particle
7. a unit of heat
8. the derived SI unit of frequency
10. a force that tends to produce an elongation of a body or structure
12. It is physical property of materials which return to their original shape once they are deformed.
14. this entity as a source of nuclear energy
16. It is height of a wave, which is measured from its center position
17. a region containing no matter; free space
18. the number of times that a periodic function or vibration repeats itself in a specified time