The Sun is what spectral type?
a. S2
b. G2
c. F2
d. K2
e. ST2 (Spectral Type 2)
b
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A soap film is being viewed in white light. As the film becomes very much thinner than the wavelength of blue light, the film
A) appears black because it reflects no visible light. B) appears blue since all other colors are transmitted. C) appears white because it reflects all wavelengths of visible light. D) appears red since all other colors are transmitted.
How high can water be theoretically lifted by a vacuum pump at sea level?
A) less than 10.3 m B) 10.3 m C) more than 10.3 m
What is light pollution?
What will be an ideal response?
The lunar highlands have more craters than the maria because ________.
A. the surface of the maria is liquid and craters quickly disappear there B. the maria are much older than the highlands C. the material composing the highlands is very soft and easily cratered D. the maria are much younger than the highlands