The 3 K background radiation represents
A) the formation of the first galaxies.
B) the outer edge of the universe.
C) the Big Bang itself.
D) the time of decoupling.
E) formation of the first quasar.
D
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The portion of the atmosphere that filters out 95 percent of the incident UV radiation is the
A) ozone layer. B) stratosphere. C) troposphere. D) aerosol layer. E) particulates.
Two devices that make use of a bimetallic strip are a __________ and a __________
Fill in the blank(s) with correct word
When there is electric current through an ionic liquid such as salty water, the moving charges are
A) only protons. B) only electrons. C) only negative ions. D) only positive ions. E) both positive and negative ions.
A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
?
