Compared to an open cluster, a globular cluster will have more hot, blue stars
Indicate whether the statement is true or false
FALSE
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Of the four known fundamental forces, the one that holds electrons into their orbits in atoms is
A) the strong nuclear force. B) gravitational. C) centrifugal. D) electromagnetic. E) Nonsense--these electrons have no forces acting on them.
Mean Life: The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the mean life (time constant) of this sample?
Fill in the blank(s) with the appropriate word(s).
Not taking dark energy into account, we seem to live now in a matter dominated universe, since the observed matter density exceeds the observed energy density
Indicate whether the statement is true or false
A line representing a wave front for a wave should be drawn:
a. from the source to the receiver. b. from one crest to the preceding crest. c. along one of the crests of the wave. d. in the direction the wave is moving.