The necessary chemical elements of life should
A) only be found on the Earth and Mars
B) be widespread in the solar system but not elsewhere in our Milky Way galaxy
C) be widespread throughout the universe
D) be widespread in our Milky Way galaxy but not in other galaxies
C
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What is important about the habitable zone around a star that makes astronomers believe life could exist there?
a. The level of UV radiation from the star is minimal there. b. Only in the life zone can complex organic molecules be found. c. Planets in the life zone will always have oxygen atmospheres. d. In the life zone water can exist as a liquid.
Atmospheric refraction makes the daylight hours a bit
A) longer. B) shorter. C) longer in summer but shorter in winter.
A 4.00-kg block slides down a frictionless inclined plane with an acceleration 3.00 m/s2. What is the angle of the incline above horizontal?
A) 35.3° B) 45.2° C) 17.8° D) 23.6° E) 53.7°
If a wave from one slit of a Young's double-slit set-up arrives at a point on the screen one-half wavelength behind the wave from the other slit, what is observed at that point?
a. dark fringe c. gray fringe, neither dark nor bright b. bright fringe d. multi-colored fringe