Summer 2007 questions
Big sale July 9, starts 10 AM
discount store 10% during the institute with badge.
discount deli 10% during the institute with badge.
The actual science is:
Polar Bear fur is not a fiber optic.
Glass is not a liquid. Some ancient windows are thicker at the top and sides.
Airplane wing lift can be completely explained in terms of Bernoulli's equations of conservation of energy, that is that when air speeds up its pressure decreases, or in terms of Newtons' equation of the change in momentum of the air, that is that then the wing deflects air downward the reaction force on the wing produces an upward force. However it is nearly impossible to calculate the lift produced by a wing from these equations instead aerodynamicists use the circulation of air about the wing to calculate lift.
The conducting metal shell of a car protects passengers from lightning, the tires do not protect passengers from lightning. The lightning has just jumped 3000 feet from the cloud to the ground the remaining 6 inches from the car to the ground will not stop it.
Recent discovery
In a sample of 256 men there were found to be 80 different versions of the chemical that converts red light into electrical impulses, rhodpsin.
Rhodopsin molecules are made from retinine molecules bound to opsin molecules. The opsin molecules tune the retinine molecules so that electrons resonate with different frequencies of light. When the red rhodopsin interacts with red light an electron moves from one bond to another causing the molecule to bend, This opens a channel which allows charged ions to flow through a cell membrane which triggers the cone cell to "fire" i.e. create a -0.1 volt electrical pulse.
Creating your own Gray step images.
Mark used photoshop to make a gray step that may be printed out on your own printer.
Print it, cut it out and place it on dark gray or balck poster paper.
Pick the size most useful to you.
Gray step with 4% gradient in gray.
Gray step with 10% gradient in pixels
Sources
Blinking lights
INOVA lights blink 100 times a second.
Laser Pointers
1 mW, AAA batteries, $7 (in quantities of 20, 2007 price)
5 mW $55 for 1, $49 for 2 $45 for 10 or more. 2007 price.
Phosphorescent paper
Educational Innovations
http://www.teachersource.com/catalog/index.html
Phosphorescent Vinyl, 1 ft. wide, about $10 a foot.
UV LED flashlight
Coast LED Lenser LL7505 V9 Microlenser, Ultraviolet UV LED Flashlight
Amazon $8.75
Magnets
Neodymium Magnets
http://www.forcefieldmagnets.com/
An article on the rate of time passage measured by clocks in a gravitational field.
Slowing light with a Bose-Einstein condensate
Bohr
Atom Model, use a gravity well to model
the energy levels of a hydrogen atom.
Tides, use a gravity well to model tides.
Here are some light activities
Peel a CD, cut the aluminizing off a compact disk to make a transmssion diffraction grating.
Laser CD, reflect a laser off a CD to measure the line spacing of the
Laser Light, Explore the properties of laser light.
Laser Milk, Laser light scattered through milk produces a 3-d time varying interference pattern
Light Box, build a simple box to explore image making
Poisson Spot, make one with a pointer laser and a BB
Ray Tracing, How to do it
Sound Analysis and Osciloscope Applications
TEEMSS has a sound waveform and spectrum display application that is very simple to use.to display sounds live. This is a JAVA program and runs on Mac or PC.
A free program for the MAC and PC intended for recording sound and analyzing the spectrum of recorded sound.
Audacity Instructions by Stephanie Chasteen
MaCRO an oscilloscope program for the MAC, alpha version is free but crashes occasionally.
Real Time Spectrum Analyzer, for the PC only. Free version provides a low resolution spectrum, you can pay betweem $39 and $100 for upgraded versions.
Real Time Analyzer Light for the PC only
$24 Simple and easy to use real time spectrum analyzer, also an oscilloscope and a signal generator.
How to measure voltage, this includes the beginning of a discussion on the relation between potential energy and potential.
How to measure current., includes a note on the experiment of Tollman and Stewart, 1916.
Photoelectric effect, a draft of the photoelectric effect activity.
Metrologic laser activities by Herb Gottlieb
Marks Grid as a PDF, a grid of 1 cm squares, 80 cm wide and 200 cm long
|
Scientific Explorations with Paul Doherty |
|
25 June 2007 |
