The oldest rocks found on Earth are about ____ years old
a. 14 billion
b. 10.5 billion
c. 7.0 billion
d. 3.9 billion
D
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Einstein's equivalence principle says that
A) everyone measures the speed of light to be equivalent. B) the effects of gravity are exactly equivalent to the effects of acceleration. C) someone traveling at 0.9c will age at the same rate as someone at 0.99c. D) all people see themselves at an equivalent distance to the center of the universe.
Briefly explain why radiation was trapped for 300,000 years during the era of nuclei, and why the cosmic background radiation broke free at the end of this era
What will be an ideal response?
Type II supernova spectra are poor in hydrogen because stars that explode this way use up all their hydrogen before they leave the main sequence
Indicate whether the statement is true or false
A pre-electronic thermostat employs a coiled
A) wire of low conductivity. B) bimetallic strip. C) tube of mercury.