What is the basic difference between electrons in a valence and a conduction band in a semiconductor? Explain
What will be an ideal response?
Electrons in the valence band are unable to move; electrons in the conduction band
can move in response to an electric field.
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A cheetah can run at approximately 100 km/h and a gazelle at 80.0 km/h. If both animals are running at full speed, with the gazelle 50.0 m ahead, how long before the cheetah catches its prey?
a. 9.0 s b. 14 s c. 18 s d. 4.5 s e. 21 s
The photoelectric effect occurs when electrons are emitted when light strikes the surface of a metal
a. True b. False Indicate whether the statement is true or false
The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars fusing hydrogen in their cores?
A) a B) b C) c D) d E) e
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the magnetic force on the deuteron to that on the proton is:
a. 1. b. 2. c. 0.5. d. There is no magnetic force in this case.