The charge per unit length on an insulator is . On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are more electrons than protons.
b. There are more protons than electrons.
c. There are more protons than electrons.
d. There are more electrons than protons.
B
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What happens when an electron in an atom absorbs a photon?
A. The electron moves to the nucleus. B. The electron moves to a lower energy level. C. The electron turns into a proton. D. The electron moves to a higher energy level.
The helium flash stage will always completely destroy a star and any planets nearby it
a. True b. False Indicate whether the statement is true or false
When a body moves in circular motion at constant speed the velocity and acceleration point in opposite directions
a. True b. False Indicate whether the statement is true or false
During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because
a. all heavy nuclei are unstable. b. no stable nuclei exist with masses of 5 or 8 hydrogen masses. c. the helium nucleus is unstable. d. the temperature and density were too low. e. no nuclei heavier than helium could form since there weren't any electrons formed.