1 P31- Technology Enabled Active Learning (TEAL) Learning without Barriers / Technology without Borders Symposium December 2, 2006 John Belcher, Peter Dourmashkin Physics Department MIT Creative Commons Attribution-Share Alike 2.5 License
Dec 22, 2015
1P31-
Technology Enabled Active Learning (TEAL)
Learning without Barriers / Technology without Borders
Symposium
December 2, 2006 John Belcher, Peter Dourmashkin
Physics DepartmentMIT
Creative Commons Attribution-Share Alike 2.5 License
2P31-
Learning Objectives of TEAL
Create an engaging and technologically enabled active learning environment
Move away from passive lecture/recitation
format
Incorporate hands-on experiments
Enhance conceptual understanding
Enhance problem-solving ability
3P31-
Broader Educational Learning Objectives
Develop communication skills in core sciences
Develop collaborative learning
Create an environment conducive to learning
and teaching
Develop new teaching/learning resources
4P31-
Desktop ExperimentsPut lecture demos into students hands
Groups of three students take data in class using LabView software.
Introduction to experimentation
Integration of concepts and experience
Graphical representation of physics concepts
5P31-
Website
web.mit.edu/8.01t/www web.mit.edu/8.02t/www
6P31-
A Sample 8.02 TEAL Class
7P31-
Thanks to the MIT first year students in 8.02 this term who are joining us today:
Nicole Bieber Christopher CosmidesMark BarineauNeeharika Bhartiya
8P31-
8.02 Class 31: OutlineWednesday Nov 29, 2006
Hour 1:
Generating Electromagnetic Waves
Plane EM Waves
Electric Dipole EM Waves
Hour 2:
Experiment 8: Microwaves generated by the spark gap antenna
9P31-
Clicker Question:Your E&M Background
10P31-
My Last Course in E&M Was In
Hig
h Sch
ool
Colle
ge
Gra
d Sch
ool
Nev
er h
ad o
ne
100%
0%0%0%
1. High School
2. College
3. Grad School
4. Never had one
11P31-
Clicker Question:Baseline E&M Knowledge
12P31-
The earth’s magnetic field in this room is:
Most
ly v
ertic
al a
nd p
o...
Most
ly h
orizon
tal a
n...
Most
ly v
ertic
al a
nd p
o...
Most
ly h
orizon
tal a
n...
0%
100%
0%0%
1. Mostly vertical and pointing down
2. Mostly horizontal and pointing north
3. Mostly vertical and pointing up
4. Mostly horizontal and pointing south
13P31-
The earth’s magnetic field in this room is:
Most
ly v
ertic
al a
nd p
o...
Most
ly h
orizon
tal a
n...
Most
ly v
ertic
al a
nd p
o...
Most
ly h
orizon
tal a
n...
0% 0%0%
100%1. Mostly vertical and pointing downward
2. Mostly horizontal and pointing north
3. Mostly vertical and pointing upward
4. Mostly horizontal and pointing south
14P31-
Answer: 1. The earth’s magnetic field in this room is mostly vertical and pointing downward
15P31-
Clicker Question:Sophisticated E&M Knowledge
16P31-
As we move our receiving antenna around the spark gap antenna as shown , we see
1. More power at A
2. More power at B
3. Same power at A & B
4. Do not know
17P31-
Review: Electromagnetic Radiation
18P31-
Recall Electromagnetic Radiation: Plane Waves
19P31-
Properties of EM Waves
8
0 0
13 10
mv c
s
0
0
EEv
B B
Travel (through vacuum) with speed of light
At every point in the wave and any instant of time, E and B are in phase with one another, with
E and B fields perpendicular to one another, and to the direction of propagation (they are transverse):
Direction of propagation = Direction of E B
20P31-
How Do You Generate Plane Electromagnetic Radiation?
21P31-
Shake a Sheet of Charge
Link
22P31-
2) If sheet position is
What is B(x,t)?
What is E(x,t)? What Direction?
Group Problem: B Field GenerationSheet (blue) has uniform charge density Starting time T ago pulled down at velocity v
1) What is B field?(HINT: Change drawing perspective)
0( ) siny t y tsheet
23P31-
Plane waves are simple but not what we usually see
How Do You Generate What We Usually See: Electric Dipole Electromagnetic
Waves?
24P31-
Generating Electric Dipole Radiation Applet
25P31-
How Do You Shake a Charge?Spark Gap Antenna
26P31-
Spark Gap Antenna
27P31-
Clicker Question:Sophisticated E&M Knowledge
28P31-
As we move our receiving antenna around the spark gap antenna as shown , we see
More
power
at A
More
power
at B
Sam
e po
wer
at A
& B
Do n
ot know
0%
50%50%
0%
1. More power at A
2. More power at B
3. Same power at A & B
4. Do not know
29P31-
Answer: 2. Maximum power at A.The electric field pattern from the spark gap
antenna is shown. We get maximum power when the line from the transmitter to the receiver is perpendicular to the direction of the antenna (at A). We get (in principle) zero power when the line from the transmitter to the receiver lies along the direction of the antenna (at B).
30P31-
Experiment 8Spark Gap Generator:
An LC Oscillator
LC
1 12.5 GHz
2f
LC
31P31-
Our spark gap antenna
6 12 4(4.5 10 )(33 10 F) 1.5 10 sτ RC
rad
1
4
cf
T l
103 10 cm/s
12.4cm
1) Charge gap (RC)
2) Breakdown! (LC)
92.4 10 Hz 2.4GHz 3) Repeat
32P31-
Spark Gap Antenna
33P31-
Spark Gap Antenna
34P31-
What Lies AheadFocus on teacher training Continued development of Teaching/Learning
resources Introduction of new communication devices into
classroomRefine experiments with a shift towards Inquiry-
Based experimentsDevelopment of tabletop demosPublication of MIT 8.01/8.02 Course Notes