What is the relationship between color and wavelength for light?
a. Wavelength increases from blue light to red light
b. Wavelength decreases from blue light to red light
c. All colors of light have the same wavelength.
d. Wavelength depends on intensity not color.
A
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The sun is
a. a star which generates its own energy b. 1 AU from Earth. c. visible by its own light emission. d. all of the above
What does the equivalent of an H-R diagram for galaxies, plotting luminosity versus color, show?
A) galaxies fill the diagram showing that there is no correlation between luminosity and color B) two clumps, one blue with relatively low luminosity, one red with relatively high luminosity, and a valley in between with few galaxies C) a continuum from faint, blue galaxies to bright, red galaxies D) a continuum from faint, red galaxies to bright, blue galaxies E) a main sequence, just as for stars
A car, driven around a circle with constant speed, must have
A) zero acceleration. B) a centrifugal acceleration. C) zero velocity. D) a centripetal acceleration. E) a tangential acceleration.
A controlled experiment has all variables held constant
a. true b. false