In order for an atom to absorb a photon (a particle of light),
A) the photon must have energy matching the difference in energy between energy levels in the atom.
B) the atom must have lost all of its electrons.
C) the photon must have enough energy to remove an electron from the atom.
D) A or C
E) B or C
D
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The atomic nucleus contains
A) yogurt. B) protons only. C) neutrons and electrons. D) protons and neutrons. E) protons and electrons.
The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?
A) It is increased by a factor of 2. B) It is increased by a factor of 4. C) It is reduced by a factor of 2. D) It is reduced by a factor of 4. E) It does not change.
A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of The train then moves at a constant velocity of for 420 s. The train then slows down uniformly at until it is brought to a halt
The acceleration during the first 5.6 km of travel is closest to which of the following? A) 0.16 m/s^2 B) 0.14 m/ s^2 C) 0.17 m/ s^2 D) 0.19 m/ s^2 E) 0.20 m/ s^2
Cold fusion has
a. solved the world's energy crisis b. been used to create superheavy elements c. been achieved using muons d. rendered nuclear reactors obsolete