A __________ lens is thicker at the center than the edges
Fill in the blank(s) with correct word
converging
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Before about 50,000 years after the Big Bang, the universe was:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Which of the following is an almost reversible process?
a. The explosion of hydrogen and oxygen to form water. b. Heat transfer through thick insulation. c. The adiabatic free expansion of a gas. d. A slow isothermal compression of a gas. e. A slow leakage of gas into an empty chamber through a small hole in a membrane.
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
a. absorb different quantities of thermal energy from their surroundings in equal time intervals. b. have different masses. c. have different volumes. d. have any of the properties listed above. e. have any of the properties listed above and one of them is contact with a third body at a different temperature.
The number of radioactive nuclei in a particular sample decreases to one-eighth of its original number in 9 days. What is the half-life of these nuclei?
A) 9/8 days B) 2 days C) 3 days D) 8 days E) 10 days