iq radio, x-ray and infrared radiation are all examples of: a. magic b. electromagnetic radiation c....
Post on 20-Dec-2015
218 views
TRANSCRIPT
![Page 1: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/1.jpg)
![Page 2: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/2.jpg)
IQ
• Radio, x-ray and infrared radiation are all examples of:
• A. Magic• B. Electromagnetic
radiation• C. Atoms and molecules• D. Cartoon characters
![Page 3: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/3.jpg)
IQ• That’s right! B. is the
correct answer!• Modern astronomical
observations from ground and space acquire information from the entire electromagnetic spectrum, from short-wavelength gamma-rays to the longest wavelength radio waves.
![Page 4: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/4.jpg)
![Page 5: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/5.jpg)
IQ
• A hot, blue star emits more energy at every wavelength than does a cool, red star.
• True• False
![Page 6: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/6.jpg)
IQ
• True. The hotter an object, the bluer it appears.
• Blue stars are hotter than red stars and emit more energy at every wavelength.
• Cool stars appear red because their peak emission is in the red.
![Page 7: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/7.jpg)
IQ• The spectrum of a gas cloud
illuminated by nearby hot, blue stars is:
• A. An absorption spectrum with many bright lines.
• B. A continuous spectrum with bright and dark lines.
• C. An emission spectrum with many bright lines.
• D. A spectrum analyzer with 3 dB rolloffs at each end.
![Page 8: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/8.jpg)
IQ• C. is the correct answer (See C., below). Atoms in the
cool gas are excited by the blue light. When they excited atoms decay to a lower energy state, they emit light characteristic of the emitting atom.
![Page 9: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/9.jpg)
IQ
• The Doppler shift (Doppler Effect) makes rapidly receding objects appear redder.
• T• F
![Page 10: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/10.jpg)
IQ
• T. The wavelength of light emitted from a receding object appears to increase, that is, it appears to be redder.
• An approaching object will appear bluer because of the Doppler shift.
![Page 11: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/11.jpg)
IQ• The speed of light, usually denoted by ‘c,’
is constant. The value of this constant velocity is very nearly 3 X 105 km/s. This means that the speed of light derived from a galaxy moving away from us at 1000 km/s will be slower by:
• A. 0%• B. (103 km/s/ 3 X 105 km/s) * 100 = 3.33%• C. 10%• D. 52.5%
![Page 12: IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters](https://reader036.vdocument.in/reader036/viewer/2022062407/56649d4e5503460f94a2dd91/html5/thumbnails/12.jpg)
IQ• The answer is A! The speed
of light is a constant, and it does not depend upon the speed of the source.
• The wavelength (or frequency) of light does depend upon the speed of the source. This is the Doppler Effect.