Which of the following molecules is the most abundant in molecular clouds?
A) CO B) H2O C) NH3 D) H2
D
You might also like to view...
Which statement must be true in order for a rocket to travel from Earth to another planet?
A) It must carry a lot of extra fuel. B) It must have very large engines. C) It must attain escape velocity from Earth. D) It must be launched from space, rather than from the ground.
The inductance of a tuning circuit of an AM radio is 4.00 mH. Find the capacitance of the circuit required for reception at 1200 kHz.
A. 2.10 pF B. 4.40 pF C. 21.2 pF D. 43.4 pF E. 27.6 pF
The process where surface waters are pushed away from the land and replaced by nutrient-rich bottom waters is called
A) downwelling. B) upwelling. C) land breeze. D) sea breeze.
What is the moderator of a nuclear reactor?
a. The control rods that halt a chain reaction if it is out of control. b. A substance that absorbs neutrons to keep the reaction in control. c. The material that slows down the neutrons to induce more chain reactions. d. The material that speeds up the neutrons to induce more chain reactions. e. The name for the fissionable material itself (usually uranium).