Posted by: mrborden | September 18, 2011

The Electromagnetic Spectrum and Telescopes


Write a paragrpah describing the various wavelengths in the electromagnetic spectrum

Speed of light and a chocolate bar!
All waves in the electromagnetic spectrum (light, x-rays, radio waves, microwaves, etc.) travel at the speed of light c=299,792,458 m/s. For any wave, the wavelength times the frequency yields the speed:

λν = c

Microwave ovens operate by creating a standing wave inside of them. Different parts of the wave cook better than other parts – imagine a three dimensional grid of evenly spaced dots where the cooking is best. The distance between these dots is the wavelength λ. Our microwave operates at a frequency of ν=2.45 GHz as most conventional ones do, so this yields a wavelength of

λ = c/ν = .122m or about 4.8 inches.

Of course, the spinning tray in the microwave is put there to offset the uneven cooking. Removing this tray, you can measure the speed of light by cooking a bar of chocolate for about a minute and half. If your bar of chocolate is big enough, there will be two circular areas where the chocolate has melted and the distance between their centers is about 4 inches. Multiplying that by the known frequency ν of the microwaves yields the speed of light!

1GHZ = 10^9 HZ 1 km = 1,000m = 100,000 cm, 1 inch = 2.5cm use 300000000 m/s speed of light

QFD: Of all human powers operating on the affairs of mankind, none is greater than that of competition. Henry Clay
?FD:How are black holes formed?
ESS 2d Students know that stars differ in their life cycles and that visual, radio, and X-ray telescopes may be used to collect data that reveal those differences.
Word of the Day : Light speed – 300,000 km per second or 3.0 X 10*8 m/s

QFD: Where talent is a dwarf, self-esteem is a giant – L Petit-Senne
?FD: Describe Nuclear Fusion?
Objective:ESS 2b: Students should know and understand:
that galaxies are made of billions of stars and comprise
most of the visible mass of the universe.
Word of the Day : Protostar – earliest stage of a star


1. Are stars made mostly of solids, liquids, or gases? __________

2. What is the name of the reaction that occurs in the core of a star that makes star hot and luminescent?_______________________

3. Stars primarily burn what element as fuel? ______________

4. What type of star is the sun?_______________________

5. What star is the hottest color? where is it on the HR diagram? _____________________

6. Which percentage of stars are main sequence stars? _______________________

7. Which stars live longer, giant stars or smaller stars, Why?_________

8. The biggest stars can end their lives as _______________________ .
9. Where are dim white stars located on the HR diagram? ______________________

10. Is space Empty, explain why or why not? ________
Finish Stations – due paragraphs

Summative project
QFD:(TH) You make the world a better place by making yourself a better person.
Scott Sorrell
?FD: What percentage of all stars are in the main sequence on the HR diagram?
Objective: Students will know and be able to understand: 2c Students know the evidence indicating that all elements with an atomic number greater than that of lithium have been formed by nuclear fusion in stars.
Word of the Day : Hydrogen Fusion – Hydrogen fuses with another hydrogen molucule to form helium.
Nuclear Fusion by Laser : Sun to Sun a film from… by Julienwifi

Friday computer Lab
1) Answer the the 3 polls located on this site then
2) Sign up for and create a website
3) Place the directions from onto your front page of your site.
4) Answer questions 7-10 (save a picture of the milky way galaxy onto your site and edit using paint from your house later or use adobe to create your picture.
5) Create a graph using adobe corel, excel, or paint from your home computer as I showed you in class.
6) Use your notes from your picture and notebook to answer the questions
7) Provide pictures, 2 paragraphs, a video, a graph and other expert analysis to answer these questions using google search engines to find answers.
8) Place the hyperlink to the website under copyright material from where you took you material.
9) Questions 1-10 due by Oct 7 you may work ahead and place your work onto your website
Video – How to use free web 2.0 tools to help your child or student learn part 1 part 2

Sea Water does not glow unless many ions are introduced
Jupiter is the largest planet in our solar system. But Jupiter is still small compared to the sun. You could fit a thousand Jupiters inside the sun!

Still, Jupiter isn’t massive enough to be a star. Stars have to have enough mass to get hot enough inside to spark thermonuclear fusion reactions. Those sorts of reactions produce energy – and that’s what makes stars shine.

Jupiter would have to have 80 times more mass than it does now, in order to ignite in its interior and shine as stars do. If it had this extra mass, the thermonuclear fusion reactions in its interior would cause it to shine.

Since that’ll never happen, you sometimes hear people called Jupiter a failed star.


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