First Hour Test –Wednesday 16 February –Bring two No. 2 pencils –An eraser (“Do you feel lucky?”) –A photo ID –Something to write on Review Session –Tuesday.

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Presentation transcript:

First Hour Test –Wednesday 16 February –Bring two No. 2 pencils –An eraser (“Do you feel lucky?”) –A photo ID –Something to write on Review Session –Tuesday 15 February –Department of Physics and Astronomy Lobby –5:00 – 7:00 PM – Drop in

IQ Radio, x-ray and infrared radiation are all examples of: A. Magic B. Electromagnetic radiation C. Atoms and molecules D. Cartoon characters

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.

IQ A hot, blue star emits more energy at every wavelength than does a cool, red star. True False

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.

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.

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.

IQ The Doppler shift (Doppler Effect) makes rapidly receding objects appear redder. T F

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.

IQ The speed of light, usually denoted by ‘c,’ is constant. The value of this constant velocity is very nearly 3 X 10 5 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. (10 3 km/s/ 3 X 10 5 km/s) * 100 = 3.33% C. 10% D. 52.5%

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.