Is the Hubble constant really constant?
What will be an ideal response?
No, with the influence of dark energy, it will gradually increase, speeding up the cosmic expansion to a final flat cosmos.
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The specific heat
As temperatures become large, the denominator in equation T4.41 becomes
A. very large. B. very small. C. approximately 1. D. approximately ?1
Astronomers have begun to build instruments to detect "cosmic messengers" that are not forms of light, such as neutrinos, cosmic rays, and gravitational waves, because they
A) provide information about distant objects that we cannot obtain from light. B) provide higher angular resolution than we can obtain with light. C) are unaffected by the turbulence of Earth's atmosphere. D) can allow us to see beyond the horizon of the observable universe.
Which one of the following is the correct number for the magnification of a plane mirror?
A) 1.0 B) 0.25 C) 0.5 D) 1.5 E) 2.0