What happens to the resistivity of a typical semiconductor as its temperature increases?
A)
The resistivity increases for a while and then decreases.
B)
The answer depends on the semiconductor.
C)
The resistivity decreases.
D)
The resistivity increases.
E)
The resistivity remains the same.
C
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Assume that (i) the energy released per fission event of 235U is 194 MeV, and (ii) 33% of the nuclear energy released in a power plant is ultimately converted to usable electrical energy. Approximately how many fission events will occur in one second in order to provide the two-GW electrical power output of a typical power plant? (1 eV = 1.6 × 10^?19 J)
a. 4E+23 fission/s b. 2E+20 fission/s c. 6E+25 fission/s d. 2E+15 fission/s e. 8E+17 fission/s
What natural barrier usually prevents two protons from combining?
A) the weak nuclear force B) dark energy C) electromagnetic repulsion D) the strong nuclear force E) gravity
A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
A) zero B) 1.6 × 10-20 N C) 3.2 × 10-20 N D) 1.6 × 10-21 N E) 3.2 × 10-21 N
The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A) 2.1 × 10-8 W B) 2.7 × 10-7 W C) 2.1 × 10-6 W D) 2.7 × 10-5 W