When many of the atoms or molecules in a sample have been excited into a metastable state, a(n) ______________ has occurred
a. ultraviolet catastrophe
b. population inversion
c. coherent emission
d. incoherent absorption
b
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A 4.00 kg mass is moving in a circular path with a constant angular velocity of 5.00 rad/sec and with a tangential velocity of 5.00 m/sec. The centripetal force on the mass is
A. 90.0 N. B. 100 N. C. 125 N. D. 169 N. E. 200 N.
If you toss a coin straight upward while in a train moving at constant velocity, the coin will land
A) as if you were at rest. B) in front of you. C) in back of you.
Magnetic confinement is used in controlled fusion experiments to control a plasma
a. True b. False Indicate whether the statement is true or false
If the Earth and all things on the Earth are continually radiating energy, why doesn't everything get progressively colder?
What will be an ideal response?