Galaxies contain less mass as dark matter than as visible stars
Indicate whether the statement is true or false
FALSE
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During a total lunar eclipse,
a. the moon must be new. b. the observer must be in the path of totality. c. the moon's color will be affected by Earth's atmosphere. d. the moon must be at about its greatest distance from Earth. e. it must be near the time of one of the equinoxes.
Single-Slit Diffraction: When a single slit that is 0.050 mm wide is illuminated by light of 550-nm wavelength, what is the angular separation between the first two minima on one side of the central maximum?
A. 0.36° B. 0.47° C. 0.54° D. 0.63° E. 1.3°
Which of the following worlds has the greatest difference in temperature between its "no atmosphere" temperature and its actual temperature?
A) Mercury B) Venus C) Earth D) the Moon E) Mars
The substance that comes from a nuclear reactor which is used to generate power is
A. graphite. B. radioactive materials. C. enriched uranium. D. high-pressure steam.