The energy of a system
a. always increases.
b. always remains constant.
c. decreases when work is done by the system.
d. decreases when work is done on the system.
c
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Which of the following cannot travel in a vacuum?
A) a light wave B) a sound wave C) a radio wave D) all can E) none can
In which of these processes is an element transformed into a completely different element?
A) alpha decay B) beta decay C) both of these D) none of the above
Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there. b. The temperature is the hottest in the center. c. The density of material is very high in the center. d. Both (b) and (c) e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
Nuclei of atoms that make up a newborn baby were manufactured in
A) the mother's womb. B) the food the mother eats before delivery. C) ancient stars. D) the Earth. E) none of the above