Blue light travels more slowly through glass than red light does
a. True
b. False
Indicate whether the statement is true or false
True
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Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?
a.
37 ?T
b.
28 ?T
c.
19 ?T
d.
47 ?T
e.
58 ?T
One phenomenon that supports the wave theory of radiation is
A) the transference of energy by a light beam. B) the tiny flashes when a light beam strikes a screen. C) the tiny flashes when an electron beam strikes a screen. D) interference effects with light. E) None of the above.
All weather and wind on Earth are a result of convection in the
a. troposphere. b. stratosphere. c. mesosphere. d. ionosphere. e. thermosphere.
At the beach you see a friend facing away from you. Keeping quiet you can cause her to turn around by
A) staring intently at her back. B) tossing small pebbles at her back. C) although staring will be less effective, both will affect a turn-around. D) none of the above