When two light atoms fuse together, mass
A) converts to kinetic energy.
B) converts to high-energy gamma radiation.
C) is created from energy of other forms.
D) is gained.
Answer: A
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Oxygen has atomic number 8. How many times must an oxygen atom be ionized to create an O+5 ion, and how many electrons will the ion have?
A) It must be ionized three times; it will have five electrons. B) It must be ionized five times; it will have five electrons. C) It must be ionized five times; it will have three electrons. D) It doesn't have to be ionized; it just needs to gain five protons. E) It doesn't have to be ionized; it already has only three electrons.
Argon rather than air is the gas used in incandescent bulbs because
A) it produces a pleasing bluish glow. B) oxygen in air oxidizes the lamp filament. C) argon is relatively plentiful. D) none of the above
Sonic Booms: A sonic boom occurs only as an airplane just reaches the speed of sound in air, but not after it increases its speed further.
A. True B. False
Refer to the sketch above of an H-R diagram for a star cluster. Which statement about this cluster is true?
A) It is probably located in the disk of the galaxy. B) It contains some stars that will soon undergo supernova explosions. C) It is probably located in a globular cluster. D) It is probably embedded in a molecular cloud in which new stars are being born.