Two light sources are said to be coherent if they are
A) of the same frequency.
B) of the same frequency, and maintain a constant phase difference.
C) of the same amplitude, and maintain a constant phase difference.
D) of the same frequency and amplitude.
B
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A car heading north collides at an intersection with a truck of the same mass as the car heading east. If they lock together and travel at 28 m/s at 46° north of east just after the collision, how fast was the car initially traveling?
Assume that any other unbalanced forces are negligible. A) 40 m/s B) 20 m/s C) 80 m/s D) 30 m/s
Each factor in the Drake Equation has a well-known, established value
Indicate whether the statement is true or false
One good argument in favor of nuclear power over coal power is that
A) the high operating temperature of nuclear plants makes this the most efficient type of generating plant. B) whereas we are running out of coal, there is a very large supply of uranium to supply nuclear power plants. C) nuclear power does not contribute to the ozone problem. D) nuclear plants do not produce any waste heat. E) nuclear power does not contribute to the global warming problem.
Select the option on which Bohr's model was not based
1.Only certain orbits are stable. In these states, electrons do not emit energy in the form of radiation. 2.Radiation is emitted when electrons make a transition from one energy state to another; the frequency of the emitted photon is related to the change in the atom's energy and independent of the frequency of the electron's orbital motion. 3.Electrons move in circular orbits around the nucleus. 4.Angular momentum is dependent solely on energy, and thus is also quantized.