When a superconductor's temperature drops below the critical temperature, its resistance:
a. equals that of a semiconductor of equal dimensions.
b. drops to zero.
c. reduces to one half.
d. increases by two.
B
You might also like to view...
An object is thrown vertically into the air. In this case air resistance affects motion. Compared with its time for ascent, the time for its descent is
A) shorter. B) the same. C) longer. D) need more information
Heat energy is one of the many various forms of energy. It defines the amount of energy contained in a body at a certain temperature
What will be an ideal response?
Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom. b. the specific jumps downward in energy that an electron has available in an unexcited atom. c. the specific jumps upward in energy that an electron has available in an unexcited atom. d. the specific jumps upward in energy that an electron has available in an excited atom. e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.
A 40 watt fluorescent bulb is rated for use in a 120 volt line. During a brownout the actual voltage drops to 102 V. The actual power dissipated in the bulb under these conditions is
A. 30.0 W. B. 47.1 W. C. 28.9 W. D. 0.283 W.