# CFI Physics Vocab 2

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1. Period
Any given point in space, a periodic wave repeats itself after a time
2. Frequency
An inverse of a period
3. Wavelength
The distance of a wave, just a period represents time
4. Reflection
An abrupt boundary between one medium and another
5. Refraction
Traveling in a different direction unless the incident wave's direction of propagation is along the normal a change in propagation direction
6. Constructive interference
Super position of a wave that are in waves with one another
7. Destructive interference
the superposition of a wave that 180 degrees of a phase
8. Longitudianl wave
the motion of particles in the medium is along the same line of the propagation of the wave
9. Ultrasound
sound waves above 20kHz
10. Doppler effect
The frequency change, the oberserved frequency is different from the frequency transmitted by the source, when the source or the observer are in motion relative to the wave medium.
11. Temperature
Thermal equilibrium, a quantity that dertermines when objects are in thermal equilibrium
12. Heat
Energy in transit between two objects or systems due to temprerature difference between them
13. Absolute zero
• the idea of all molecular matter coming to a complete stop. The lower limit of attainable temperature.
• 0 degrees K
14. Ideal gas law
establishes a relationship between pressure, volume, the amount of gas, and absolute temperature
15. Internal evergy
The total energy of all molecules in a system, except for microscopic energy
16. Specific heat
The heat capacity per unit mass
17. Conduction
takes place within solids, liquids and gases, due to collision between molecules and atoms in which energy is exchanged
18. Convection
Involved fluids that carry heat from one place to another. Material moves unlike conduction
19. Electric conductor
Materials in which some charge can move easily
20. Electric insulators
Materials in which some charge cannot move easily
21. Electric field
Electric force per unit charge
22. Electrostatic equilibrium
No net motion of charge
23. Capacitor
Device that stores potenital energy by soting seperated positive and negative charges
24. Direct Current
The current on any branch always moves in the same direction
25. Alernating current
Circuits in which the currents occasionally reverses the current
26. Ohms law
The current is proportional to change in voltage
27. Motional EMF
Induced when conductor is moved in a magnetic field