A radar operator on Earth sees two spaceships moving straight at each other, each with speed 0.60c. With what speed does the pilot of one ship see the other ship approaching?
What will be an ideal response?
0.88c
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A pn-junction is produced by doping silicon that has an energy gap of 1.11 eV with arsenic (Group V) to produce the n-type material, and with boron (Group III) to produce the p-type material.
(a) At temperatures approaching absolute zero, what is the value of the Fermi energy in the n-type and p-type material? (b) At temperatures approaching absolute zero, what would be the value of the contact potential at a pn-junction of these two materials? (c) At temperatures in the intrinsic range of operation for both of these materials, what is the value of the contact potential?
If the rate at which a pulsar is slowing down is found, this helps us find the time at which it was produced by the supernova
Indicate whether the statement is true or false
The existence of the Ring of Fire is best explained by the
a. theory of plate tectonics. b. principle of superposition. c. concept of uniformitarianism. d. law of catastrophism.
The changing of a vapor into a liquid is called
A) condensation. B) evaporation. C) dew point. D) saturation point.