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!