Calendar
9/29/13
2
Physics Help Center
9/29/13
3
Lecture 12
Electrostatics
motion of q in external E-field
E-field generated by q
Magnetostatics
motion of q and I in external B-field
B-field generated by I
Electrodynamics
time dependent B-field ge
Final Exam: Tuesday December 11, 2013 from
10:30 AM to 12:30 PM
*Covers all readings, lectures, homework from
Chapters 27 through 30 (plus final lec.)
*Location: WTHR 200
Be sure to bring your student ID card,
calculator, pencil and three one-page (twosid
Announcement
No lecture on Monday Nov 25,
2013 to compensate for evening
exam.
Lecture Quiz scores will be updated
over Thanksgiving break.
After Thanksgiving break, please check your
quiz scores.
11/12/13
2
Wave-Particle Duality
1. Isaac Newton (16421
Quantum View
1924 Louis de Broglie:
.think of an electron or any other particle as a matter wave that
transfers energy and momentum to other matter at points.!
de Broglie wavelength of a moving particle:
h
=
p
11/18/13
2008 by W.H. Freeman and Company
2
E
LECTURE 21: Relativity
The Relativity Postulate
*The laws of physics are the same for all observers in
all inertial reference frames. No frame is preferred.
frames do not accelerate. Instead they move at
constant velocities relative to each other.
11/6/13
Conceptual questions
1. Yes, we can tell if the elevator is moving upward or downwards just by looking at the scale. In
order to make this assessment we would need to be able to read the measurements on the
scale. If the elevator is going downwards we wou
Conceptual questions
1. There are two points at which the object has the maximum speed and only one point at which
the speed is the lowest. If we think of the parabola shape, the objects maximum speed is at the
lowest points on the parabola. In other word
Conceptual questions
1.
ar =
V2
r
B
A
V A =2V B
r a=2r b
(2V b)2
2r b
arA
=
=2
arB
V b2
rb
The centripetal acceleration of the point A is twice bigger than centripetal acceleration of the point B.
2. Telecommunication satellites that travel in the geostat
Conceptual questions
1.
The momentum of object is defined as the product of objects mass and velocity, p=m*V. As the
momentum of the gun is the same but opposite as the momentum of the bullet that means that the
product between the mass of the gun and the
Lab1: Measurements and Experimental Errors
Conceptual questions
m
1. x=1.50m, V=344 s
x
V= t
,t=
x
V
=
, maximum sampling rate?
1.5 m
m
344
s
= 0.00436s
Time taken for pulse to be emitted and detected back by the ultrasonic motion sensor= t*2=
0.00872s
Ma
Conceptual questions
1. The density will be the same when measured on the Earth and on the Moon, since density only
depends on the mass of the object (which stays the same). The weight will be different but the
density will be the same at Moon and on Eart
Exam 2 Wed. Nov. 6, 2013 from 8PM-10PM
*Covers all readings, lectures, homework from Chapters
21 through 26.3.
*The exam will be multiple choice and is meant to be done
within 75 minutes by a well-prepared student. We will
give 120 minutes starting prompt
The Relativity of Time
*Relative motion change change the rate at which time passes.
*The amount by which a measured time interval is greater than
to, the proper time, is called time dilation.
t =
v
=
c
t o
v
1
c
and
2
=
1
1 2
t = t o
11/10/13
2
Examp
New Physics: Quantum
h
Matter has wavelength: =
p
Schrdinger wave equation:
Fundamental uncertainty:
Quantum tunneling:
11/20/13
2 2
2m x 2 + U ( x ) = E
xp
2
T exp ( L / )
2
Structure of the Atom: Early Models
Plum-Pudding Model
11/20/13
3
Structu
Lecture 9: Sept. 18, 2013
RC Demos
Magnetic Fields
Magnetic Forces
Charging a Capacitor
Q = C (1 e
at
t /
)
t=0
t=
t =
t /
I= e
R
at
t = 0
t=
t =
9/17/13
3
Discharging a Capacitor
Q = C e
t
RC
at
t = 0
t=
t =
I=
e
R
t
RC
at
t = 0
t=
t =
9/17/1
Motion of a Point Charge in a Magnetic Field
9/22/13
2
Period of Circular Motion
The period of the motion is
or, the angular frequency
9/22/13
3
Mass Spectrometer (Ions with same KE)
The purpose of a mass spectrometer is to separate ions by mass and
measu
Lecture 11: Sept. 25, 2013
Magnetic field of straight wire
Magnetic field of current loop
Magnetic field of solenoids
Exam 1:
*Covers all readings, lectures, homework from Chapters
17 through 20
*The exam will be multiple choice and is meant to be done
How much current will flow in a circuit?
Analogy:
Want to predict I
Potential difference V
defines amount of the
current that flows in
a circuit
If water height difference (potential
energy) is maintained, the flow rate
of water will not change
The flow
Polarization
Oncoming
view:
10/15/13
plane
polarized
light
2
Unpolarized Light
10/15/13
Project l onto the y, z
axes:
3
Linear Polarization: Intensity Reduction
TA
UP
(unpolarized light)
n
TA
E1
I=I0
LP
I1=?
LP
10/15/13
E2
I2=?
4
Cross Polarizers
Exam 1:
*Covers all readings, lectures, homework from Chapters
17 through 20
*The exam will be multiple choice and is meant to be done
within 75 minutes by a well-prepared student. We will
give 120 minutes starting promptly at the listed time, so
please b
Lecture Topics
Fermats Principle
Snells Law
Geometric Optics
Lenses
Mirrors
10/20/13
2
Refraction
1
n1
n2
2
n1
n2
10/20/13
3
Propagation of Light: Fermats Principle
The path taken by light traveling from one point
to another is such that the time of
Lecture 14
EMF and Generators
LC Circuits
Maxwells Equations and EM Waves
Alternating Current Generators
(N = 2 for this coil)
B = NBA cos( t)
B
=
= NBA sin( t)
t
max = NBA
10/8/13
3
LC Circuits
Consider the LC and RC
series circuits shown:
Suppos
Electromagnetic
Spectrum
10/14/13
2
Visible Light
10/14/13
3
White Light: A Mixture of Colors (DEMO)
10/14/13
4
White Light: A Mixture of Colors (DEMO)
1.Add together magenta, cyan, and
yellow. Play with intensities of each
to get white light.
2.Take look
Archimedes' principle is a powerful tool for solving many problems involving equilibrium in
fluids. It states the following:
Whenabodyispartiallyorcompletelysubmergedinafluid(eitheraliquidoragas),thefluidexertsanupward
forceonthebodyequaltotheweightofthef
Recitation 1 1/22
Phys 220
Physics 220: General Physics
Michael Meier
mdmeier@purdue.edu
Office: Phys Room 381
Help Room: Phys Room 11A
Open Fridays & Mondays
My Hours: Mon 12:302:30 pm
Recitation: Fridays in Phys 114 10:30 am-11:20 am (Sec 4)
or 11:30 am