Proposed Test Review Session Tuesday Evening, 15 February 5:00 PM – 7:00 PM Physics and Astronomy (NE corner of Lomas & Yale) - Lobby Practice test Answer.

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Presentation transcript:

Proposed Test Review Session Tuesday Evening, 15 February 5:00 PM – 7:00 PM Physics and Astronomy (NE corner of Lomas & Yale) - Lobby Practice test Answer astronomy questions Tips on test taking (in general)

First Hour Test Wednesday, 16 February 7:00 PM - 8:15 PM (normal class period) Chapters BRING TWO No. 2 PENCILS –WITH AN ERASER! Bring a picture ID

IQ The hotter of two stars will appear bluer. True False

IQ True. The hotter an object, the bluer it appears. Blue stars are hotter than red stars.

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.