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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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
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
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
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