AP Physics B Compton Scattering & Photo Electric Effect

• Day 79
• Use the photon theory and Compton's hypothesis to calculate the wavelength of a photon after it has been scattered as a result of a collision with an electron.
• Compton Scattering
• Notes

Introduction
The Compton Effect is the quantum theory of the scattering of electromagnetic waves by
a charged particle in which a portion of the energy of the electromagnetic wave is given
to the charged particle in an elastic, relativistic collision. Compton scattering was
discovered in 1922 by Arthur H. Compton (1892-1962) while conducting research on the
scattering of x-rays by light elements. In 1922 he subsequently reported his experimental
and theoretical results and received the Nobel prize in 1927 for this discovery. His
theoretical explanation of what is now known as Compton scattering deviated from
classical theory and required the use of special relativity and quantum mechanics, both of
which were hardly understood at the time. When first reported, his results were
controversial, but his work quickly ...

Losing My Marbles Lab P.9

SUBMIT LAB AND DATA HERE! DUE Friday!!!

.Conservation of momentum in 2-D
Momentum is conserved

• The total momentum before = the total momentum after
• Write the above idea down mathematically.
• Use your labeled and measured diagram to complete the expression i.e. What represents momentum? Why?
• this is the only physics idea in the lab
• Key Skills Required to complete the lab:
• Vectors
• Define F.O.R.
• Break into individual X&Y problems
• Find X&Y components
• Measurements
• Geometry
• Algebra

Whiteboard in real time: 

http://www.twiddla.com/1562677

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Phreshman Graphing motion 1-14

Discuss, post and answer questions here on the HW.

Link to the WS:

U3_ws1.pdf

Read & Follow the directions carefully.

Help Drawing Slopes:

Drawing Slope and tangents

***  Here is a simulation to help you see and predict p/v/a graphs  this is on the test this week.

--->>the above link requires java be installed and you may need to make an exception in your java control panel.  see instructions

AP PHYSIC The Photo Electric Effect

Make Sure your Browser has Java running and enabled .
If the simulation does not run click here: Java
Objective use the same process described in class and determine the rules of photoelectric emmission
Identify related variables
Identify trends maxs and mins
A diagram should be in your notes as well
You may discuss on the Blog and work collaboratively

Click to Run

Pd4 Graph Stacks

Discuss questions and ideas here.  For questions 4-6.

AP Physics Test Tue Circuits and Electricity

Test Review Circuits
Test will include some electrostatic principles.

P.9 Momentum

Objectives

After studying the material of this chapter, you should be able to:
1. Define linear momentum and write the mathematical formula for linear momentum from memory.
2. Distinguish between the unit of force and momentum.
3. Write Newton's Second Law of Motion in terms of momentum.
4. Define impulse and write the equation that connects impulse and momentum.
5. State the Law of Conservation of Momentum and write, in vector form, the law for a system involving two or more point masses.
6. Distinguish between a perfectly elastic collision and a completely inelastic collision.
7. Apply the laws of conservation of momentum and energy to problems involving collisions between two point masses.


Day 72
Momentum Makes me want to PUKE
Develop Strategies & Practice solving simple momentum and Impulse questions
Recitation and questions
HW
Complete 5 of the practice problems


Day 71 
Summarize Newtons Cradle Activity
Demonstration Impulse & A Change in Momentum
"Egg-citing Physics"
Explain how the same impulse can yield different results and why?


Day 70
Make Observations about Newon's Cradle
Guided Demonstration/Lab
Define Determine Differentiate Momentum and Impulse

AP P2

Complete & Discuss on the Blog

The 1995 question

 Questions

 Methods

 Solutions

Also for the circuit with a capacitor (2000) look at your equation sheet. Easy Peasy.

AP P2

Complete the Question below.  

•

In the circuit shown below, A, B,C, and D are identical light bulbs.  Assume that the battery maintains a constant potential difference between its terminals (i.e., the internal resistance of the battery is assumed to be negligible) and the resistance of each light bulb remains constant.

Draw a diagram of the circuit in the box below, using the following symbols to represent the components in your diagram.  Label the resistors A,B, C, and D to refer to the corresponding light bulbs.

->List the bulbs in order of their brightness, from brightest to least bright.  If any two or more bulbs have the same brightness, state which ones.  Justify your answer.

->Bulb D is then removed from its socket.

.

Describe the change in the brightness, if any, of bulb A when bulb D is removed form its socket.  Justify your answer.

->Describe the change in the brightness, if any, of bulb B when bulb D is removed from its socket.  Justify you answer.

 B.  List the bulbs in order of their brightness, from brightest to least bright.  If any two or more bulbs have the same brightness, state which ones.  Justify your answer.

.

Describe the change in the brightness, if any, of bulb B when bulb D is removed from its socket.  Justify you answer.

 

Bulb B becomes brighter.

It was receiving the least amount of current since D was an alternate pathway for the current.  With D gone all the current must go through B, which is in series now.  More current means B will be brighter.

All Ramped up period 4 only

Discuss this online via the blog include your first initial last name in the post.

Some hints:

Why is this graph signicant to the lab?

How is this different than any other WB?

What is the idea that explains the difference?

Sorry did this Friday & it said it posted!

Fc Right Round The Lab

Due  3.14.14
Day 67,68 
NJ STATE STANDARD 5.1
NJ STANDARD5.2 E

Submit Your Data & calculations here

Objective:  Develop record and safely execute a lab that will prove Fc=(mv^2)/r
record all data in notebook using charts and or tables.

• Wear Goggles while labs are being performed
• You may discuss any ideas questions or concerns on the blog.
• Groups of 2
• You are responsible for your own calculations!!! you have been warned.