A changing electric field will produce a
A)
current.
B)
gravitational field.
C)
magnetic field.
D)
radiation field.
E)
none of the given answers
C
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Answer the following statement true (T) or false (F)
How does gravitational lensing tell us about the mass of a galaxy cluster?
A) Using Einstein's general theory of relativity, we can calculate the cluster's mass from the precise way in which it distorts the light of galaxies behind it. B) The lensing allows us to determine the orbital speeds of galaxies in the cluster, so that we can determine the mass of the cluster from the orbital velocity law. C) The lensing broadens spectral lines, and we can use the broadening to "weigh" the cluster. D) Newton's universal law of gravitation predicts how mass can distort light, so we can apply Newton's law to determine the mass of the cluster.
Which domains of life are closely related to each other?
A) Eukarya and Archaea B) all three are closely related C) Bacteria and Eukarya D) Bacteria and Archaea
All the gamma-ray bursters measured to date have distances of millions or even billions of light-years
Indicate whether the statement is true or false