When an atom changes its energy state from n = 4 to n = 2
A) a photon is emitted.
B) a photon is absorbed.
C) two photons are emitted.
D) two photons are absorbed.
E) None of the given answers are correct.
A
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Sound waves in space
A) do not exist. B) travel so slowly that they are unnoticeable. C) travel much faster than sound on Earth but have such low density that they are inaudible. D) travel much faster than sound on Earth and are therefore very loud. E) can travel through the halo but not the disk of the galaxy.
Suppose you charge two transparencies by rubbing and then hold them near each other without letting them touch, and shake both of them back and forth. Regarding the electric and magnetic forces they exert on each other,
A) they will exert both and electric and magnetic forces. B) they will exert neither electric nor magnetic forces because they are not in contact with each other. C) they will exert electric forces but not magnetic forces. D) they will exert magnetic forces but not electric forces. E) they will exert electromagnetic forces only after five o'clock on Friday afternoons.
Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?
a. 0.25T b. 0.50T c. 0.67T d. 0.71T
Light in air is initially traveling parallel to the face AC of an equilateral triangular prism, as shown in the figure
The prism is made of glass with an index of refraction of 1.52. If the light does not strike the face AC, what is the angle between the ray as it leaves the prism at face BC and the normal in air at that face? A) 83° B) 19° C) 59° D) 27° E) 55°