please be seated. it’s physics physics is phun november 2007
TRANSCRIPT
Pleasebe
Seated
It’s Physics
Physics is Phun
November 2007
How does amagnifying glass
work?
Why does the pitchof a train whistle
change as itpasses you?
Fraunhofer Spectrum
Why do you producean electric spark
when you shuffle across a rug
and touch metal?
Quantum Mechanical Tunneling
TriboelectricityThe tribeoelectric series:
+ POSITIVE END OF SERIES glass nylon wool
silkpaper cotton
synthetic rubber saran
polyethylene Teflon
silicone rubber- NEGATIVE END OF SERIES
Van de Graaff generator
Charging by Induction
What causes lightning?
Electric charge in cloud
Possible lightning paths
Charge and image
The “Leader”
Main Stroke
Lightning striking
tree
Lightning striking Empire State
Building
Shoes of man struck by lightning
Man not hurt!!
How does alightning rod work?
How does amicrowave oven
work?
Polar Molecule
• Effect of electric field on polar molecule
• http://www.colorado.edu/physics/2000/applets/h2ob.html
Marie Sophie Germain (1776-1831)
Solved mathematical equations for theChladni Plate experiment.
Received the Napoleon Prize (1 kg gold)for Mathematics in 1816
Sophie’s World web sitehttp://www.geocities.com/Paris/Villa/1776/
Microwave oven
Standing waves in oven
Superheated Waterhttp://www.phys.unsw.edu.au/%7Ejw/superheating.html
How doPolaroid sunglasses
work?
Polaroid sunglasses remove horizontally polarized glare
What makesa rainbow?
Why do stars“twinkle?”
Why is the sky blue?
Why is the sunset red?
Is the sky blue,or does it justlook like it?
Rayleigh scattering:
Light scatters off dust,O2 and N2
Sunrise from airplane #3
Sunrise from airplane #2
Sunrise from airplane #1
We are on the web at
http://www.physics.umd.edu/lecdem/
Animated Gifs compliments of bellsnwhistles.com
The EndSee you in January!