hw

due Monday (C) and Tuesday (E):

1. Write and solve two different Coulomb's law problems, solving for something different in each case.

2. Research the phenomenon of lightning, jotting down some brief notes about the topic.

3. Define voltage.

HW

This is due for C block next Thursday. For E block, next Friday (do the previous one for wednesday).

1. What is Coulomb's law? Give a description and a mathematical expression - don't forget to identify what the variables represent.

2. If the charge of one proton is 1.6 x 10^-19 C, how many protons are required to make a coulomb of charge?

3. What is the charge of a balanced hydrogen atom? Does this answer change for deuterium (an extra neutron in the nucleus)?

4. What is the charge of a helium atom that is missing an electron?

5. What is the force that exists between two 5 coulomb charges that are 0.05 m apart?

6. Coulomb's law is an "inverse square" law. What does that mean? What happens to the force between charged ifmthe distance between them is doubled? Tripled? Halved?

Electricity HW

Questions to answer in your notes. Apologies for not posting earlier.

1. What is charge?
2. What is the unit of charge?
3. What is the charge on an electron? How about a proton?
4. How do we generally charge something?
5. How do you suppose the rotating stick demo worked?
6. Look up Coulomb's law. Describe briefly.
7. Can protons, electrons or neutrons be broken into smaller particles? How so?

Test review

HW for Weds/Thurs

Create a study sheet for the test. Things you believe will be important to know for the test. Test days are:

Friday - C block
Monday - E block

Some questions to try:

1. A 10-cm focal length lens is used in an experiment. An object is placed 30-cm away from it. Find the following:

a. location of image
b. type (R/V) of image
c. magnification of image
d. up or down?
e. What type of lens is this?
f. How would this problem be different if the focal length of the lens were -10 cm?

2. (Review on Snell's Law)

A light (wavelength of 700 nm; 700 x 10^-9 m) hits a rectangular piece of plastic, striking it an angle of 40 degrees (with respect to a normal line). The angle of refraction inside is 17 degrees. Find the following:

a. index of refraction of this plastic
b. speed of light OUTSIDE block
c. frequency of light OUTSIDE BLOCK
d. speed of light OUTSIDE BLOCK
e. speed of light INSIDE BLOCK
f. frequency and wavelength INSIDE BLOCK
g. critical angle of this plastic
h. picture to represent this problem

3. Consider the recent lab. You have a diffraction grating, 500 slits/mm. A 650-nm laser is directed at it. Find the following:

a. d (in m), knowing that the grating has 500 slits/mm
b. angle of diffraction for n=1
c. How many images could be seen? (This is a tricky one.)

Thanks!

HW

Read about holography - define it and find out aout practical applications

Hw

As mentioned in class -

Interpret/research the diffraction equation.

n lambda = d sin(Q)