The presently accepted value of the Hubble constant gives an age of
A) 4.5 billion years.
B) 8-9 billion years.
C) 14 billion years.
D) 18 billion years.
E) 22 billion years.
C
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Which of the following is(are) drawbacks to the use of methane hydrate as a fuel?
a. When melted, it produces methane, a greenhouse gas. b. It is difficult to mine as a solid located at the bottom of the oceans. c. It is mixed with water. d. All of these are drawbacks associated with methane hydrate.
The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
D
e.
C and D
If the Earth were to be moved to where Venus is today,
A) the oceans would evaporate, blocking light from the Sun and causing global temperatures to fall B) carbon dioxide would be released from the oceans leading to higher temperatures but liquid water could still exist on the surface C) the oceans would evaporate slightly producing a slightly warmer, more humid planet D) the oceans would evaporate and carbonate rocks would decompose producing a runaway greenhouse effect much more severe than the one that exists on Venus today
The electrical conductivity of an intrinsic semiconductor is due to the creation of free electrons in the conduction band and _________in the valence band.
Fill in the blank(s) with the appropriate word(s).