Final exam topics

Relativity and Einstein
Electromagnetic induction (generators)
Electromagnetism (motors, too)
Magnetism
Series circuit
parallel circuit
Ohm's Law (V = IR)
Current (in amperes)
Resistance (in ohms)
Voltage (in volts)
Electrostatics - Coulomb's law
Charge (proton, electron)
Diffraction
Holography
Optics - images formed by lenses and mirrors
Real vs. Virtual images

Know these things:

the difference between real and virtual images
the basics of interference patterns
the basics of holography
what charge is
the difference between proton and electron and neutron
the difference between voltage, current and resistance
the inverse square law idea of Coulomb's laws
relevant units
how to use Ohm's law to calculate current
the difference between series and parallel circuits
magnets and electromagnets - differences, similarities
what electromagnetism is
what electromagnetic induction is
the gist of special relativity (time dilation, length contraction)

Some practice questions:

1. Consider 2 twins: Stacey and Spacey. Stacey stays put and Spacey travels in a spaceship at 1/2 the speed of light. Upon her return, how would Stacey and Spacey compare their ages?

2. In the above example, how would Spacey compare the distance traveled (on her spaceship odometer) to the distance measured before the trip began?

3. What's the big deal about Einstein's "Miracle Year"?

4. What is required for electromagnetic induction to occur? (Basically, how do generators work?)

5. What is required for electromagnets to work? (What is a telegraph?)

6. What do magnets and electromagnets have in common?

7. What is the difference between AA, AAA, C and D batteries?

8*. What is the typical household voltage in the USA?

9*. Speaking of household voltage in the USA - does it provide direct (constant) or alternating current?

10. What current results from a 9-V battery in series with a 100-ohm resistor?

11. What current would result from a 9-V battery in series with TWO 100-ohm resistors?

12. In problems 10 and 11 above, if the resistors were light bulbs, which would be brighter?

13. If you had 2 100-ohm light bulbs in parallel with a 9-V bulb, what would be the current through EACH one? Would they be brighter, dimmer or the same as one bulb? How about compared to TWO identical bulbs in series?

14. What is the difference between electrons and protons, considering their:
a. charge
b. mass
c. location in an atom

15. Two identical charges are some distance apart. What can you say about the force between them (attractive, repulsive?)

16. In the previous problem, if the distance were doubled, what would happen to the force?

17. A convex lens ALWAYS gives a real image? True or false? Discuss.

18. What is the difference between a real and virtual image?

19. What exactly are holograms?

20. What can interference patterns show you?

* Not discussed in class.