An x-ray can be emitted when an electron undergoes an energy level transition
a. True
b. False
Indicate whether the statement is true or false
True
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When the rate of burn and the exhaust velocity are constant, a rocket ascends with
a. decreasing acceleration. b. decreasing velocity. c. constant velocity. d. constant acceleration. e. increasing acceleration.
Shapley found the globular clusters were strongly concentrated toward Sagittarius
Indicate whether the statement is true or false
Suppose a current-carrying wire has a cross-sectional area that gradually becomes smaller along the wire so that the wire has the shape of a very long, truncated cone. How does the drift speed vary along the wire?
1.It slows down as the cross section becomes smaller. 2.It speeds up as the cross section becomes smaller. 3.It doesn't change. 4.More information is needed.
A__________is a type of active galaxy nucleus that is especially variable and has few or no spectral emission lines
A) blazar B) pulsar C) quasar D) quark