#1 Electromagnetic Spectrum Intro

Transcription

1 Go here for text on each section #1 Electromagnetic Spectrum Intro Go here for the video a. How are EM waves similar to ocean waves? b. How are EM waves produced? c. How are EM waves different from ocean waves? d. What is the range of the wavelength of EM waves? e. Which waves are the shortest? longest? f. Which have the most energy? least? g. Why is a leaf green? h. A graph that shows how some materials emit, reflect, and absorbs the electromagnetic spectrum is called the: i. How do scientists use this information?

2 #2 Radio waves Go here for the video a. How do radio waves fair on the EM spectrum as far as length and energy? b. Who discovered the radio waves? c. What was the amazing discovery by Karl Jansky about radio waves in 1932? Why was it an important discovery? d. Why do astronomers need such large satellite dishes? e. What are some of the discoveries made about our universe using radio wave technologies? f. How do we typically use radio waves?

3 # 3 Microwaves Go here for the video a. State some applications of how you use microwaves: b. What is the range of the microwave wavelength? c. What is Doppler radar? d. Microwaves are a portion or "band" found at the higher frequency end of the radio spectrum, but they are commonly distinguished from radio waves because of the technologies used to access them. Different wavelengths of microwaves (grouped into "sub bands") provide different information to scientists. What information does the medium length C band provide scientists? e. What is the L band used for? f. How do astronomers use microwaves? g. What was the accidental discovery in 1965 using long L band microwaves?

4 #4 Infrared Waves Go here for the video a. What is the most common device that uses IR waves in your house? b. How was it discovered? c. What is the range of infrared waves? d. How can we sense IR waves? e. In order for us to see the infrared spectrum, we need specialized goggles. How do they work? f. Why do astronomers use IR waves? g. Ultraviolet, visible, and a limited portion of the infrared spectrum (sometimes called shortwave radiation) drive our earth system. What happens to them when they reach Earth? (Remember grade 10?) h. What do the CO 2 and water molecules do with the long wave infrared radiation? What does this mean? i. Infrared has two main sections: near and far wave radiation. What do scientists do with this information? j. Biology aside, what do the chlorophyll and the cell structure of most leaves do with the EM spectrum? How do scientists use this information?

5 #5 Visible Light Waves Go here for the video a. Define Visible Light. b. What colour is visible light seen as? c. What colours can visible light be split into? d. What was Newton s contribution to the development of theories for visible light? e. How can light be used to determine composition of different parts of the universe? f. How can scientists use light to determine the chemical composition of the atmosphere? g. Why is the sky blue? h. Why is the sky red/yellow when the sun is setting? i. How can the colour of stellar objects be used to determine information about them? j. What are some of the different colours of the stars and at what temperature do they burn? k. Describe how Lasers to determine topography? Give 2 Examples. l. Describe how the IceSat uses Lasers to determine topography of the Antarctic and what can scientists do with this data?

6 #6 Ultraviolet Light Waves Go here for the video a. What animals can see light just outside the visible spectrum? What is an example of how we use this to get rid of these pests? b. How did Johann Ritter determine that there was light beyond the violet light? c. What are the possible wavelengths for UV radiation? d. What are the three types of UV radiation? Which is the closest to visible light? e. Which is the longest wavelength and which is the shortest? Which can cause sunburns? Which is the most dangerous? What happens to most of the energy from these two types of UV? f. What atmospheric compound removes UV rays from the atmosphere? g. Why is this a problem for studying naturally produced UV radiation? h. What is the solution? Why do scientists need to do this in order to study stars? i. How do UV waves help to determine the composition of Saturn? j. What can scientists use UV radiation from distant stars to study?

7 #7 X Rays Go here for the video a. Star explodes to produce? b. What did Wilhelm Roentgen discover? c. What are X Rays? d. What can scientists in labs use X Rays for? e. What are 2 molecules that X rays were used for in order to discover their composition? f. What did X rays discover in Martian rocks? g. How can X rays determine the temperature of objects in space? h. Name four celestial objects that produce X rays. i. What information were X rays of the sun able to determine? j. What are four things that X rays can determine about an object?

8 #8 Gamma Rays Go here for the video a. How are Gamma rays created? b. How do scientists study Gamma radiation? c. How is Gamma radiation created on Earth? d. What is one reason that Scientists study the sun and the Coronal explosions? e. What can Gamma rays do to living cells? How do doctors utilize this energy? f. How does the Gamma radiation compare to the size of an atom? g. How do Gamma detectors work? h. How can we use Gamma rays to determine Martian rock composition? i. Name three celestial objects that send Gamma Radiation to the Earth? j. Fermi Satellite was able to use this Gamma Radiation to do what? k. What is a Gamma Ray burst?