________ occurs when an electron in an atom jumps from a lower energy orbital to a higher energy orbital.
A. Acceleration
B. Ionization
C. Relaxation
D. Excitation
Answer: D
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Which of these is NOT a common misconception?
a. A light year is a unit of time. b. Stars look like disks when seen through a telescope c. A galaxy is a star plus its planets. d. All of the other choices are misconceptions.
The fact that the sky is dark at night proves that the universe cannot be
A) eternal and unchanging with an infinite number of stars. B) expanding. C) more than 20 billion years old. D) infinite in size.
Two masses, MA and MB, with MB = 2MA, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen equal distances, we find that
a. KB = KA. b. KB = 2KA. c. KB = 4KA. d. KA = 2KB. e. KA = 4KB.
The linear momentum of an extended object is the product of the object's mass and the velocity of its center of mass
Indicate whether the statement is true or false