When water changes to ice, energy is _______.
a. released by the water
b. changed to a different form
c. absorbed by the water
d. None of the answers is correct.
Answer: a. released by the water
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The explosion of a supernova type II can leave behind
a. a planetary nebula. b. a shell of hot, expanding gas with a white dwarf at the center. c. a shell of hot, expanding gas with a neutron star at the center. d. Nothing is ever left behind.
A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
f the distance between two point charges remains constant while the size of one of the charges is quadrupled, the force between the charges is multiplied by
A. 1/4 B. 2 C. 4 D. 16
Ten meters away from a long straight wire, the field is 10-4 Tesla. What current flows through the wire?
What will be an ideal response?