The process that effectively regulates Earth's average temperature is
a. the greenhouse effect.
b. Rayleigh scattering.
c. the dew point.
d. auroras.
[Ques. 2] What is the symbol used on the periodic table for the element Rubidium?
a. Rf
b. Hs
c. Rb
d. No
e. U
[Ques. 3] A superconducting wire carries a current of 1.0 104 A. Find the magnetic field at a distance of 1.0 m from the wire.
[Ques. 4] The stratosphere and the troposphere account for ______________ of the mass of the atmosphere.
a. 80
b. 90
c. 99.9
d. 78.1
[Ques. 5] How many protons does Radon have?
a. 6
b. 101
c. 31
d. 103
e. 86
[Ques. 6] What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 105 T?
[Ques. 7] Some of Earth's artificial satellites orbit in the
a. stratosphere.
b. troposphere.
c. mesosphere.
d. thermosphere.
e. exosphere.
[Ques. 8] How many protons does Tc have?
a. 93
b. 58
c. 48
d. 107
e. 43
[Ques. 9] Two wires, each having a weight per unit length of 1.0 104 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
[Ques. 10] At 1800 degrees Fahrenheit, this part of atmosphere is heated almost directly by the Sun's rays.
a. Stratosphere
b. Troposphere
c. Mesosphere
d. Thermosphere
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