Which mysterious phenomena do scientists attribute to dark energy?
A: The increasing rate of expansion of the universe.
B: Mysterious bonding that holds atoms together.
C: The creation of the cosmic microwave background.
D: The formation of Helium through nucleosynthesis.
E: Dark energy causes ALL of the above.
Ans: A: The increasing rate of expansion of the universe.
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When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction
a. is an acid–base reaction. b. is endothermic. c. never reaches equilibrium. d. is exothermic.
Only odd harmonics can be produced in a(n) ________ organ pipe
A) closed B) narrow C) open D) wide
By examining the following three images, what can you conclude?
a. Venus is covered with clouds. b. Earth has a large amount of liquid water. c. Some form of ice does exist on Mars, but it does not have large amounts of liquid water. d. The planets in order from the least to most dense atmospheres are Venus, Earth, and Mars. e. all of the above
A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the distance from the slit to the screen is doubled?
A) It will be cut to one-quarter its original size. B) It will be cut in half. C) It will double. D) It will become four times as large. E) It will become eight times as large.