If an element has a band gap of 1 eV between a filled valence band and an empty conduction band, it would be classified as a(n)
A. insulator.
B. conductor.
C. resistor.
D. semiconductor.
E. reactor.
D. semiconductor.
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If the lifetime of a particle is roughly inversely proportional to the relative strength of the force involved, then for the strong, electromagnetic, and weak forces, arrange the forces according to their resulting lifetimes ranging from shortest to longest lifetimes
a. strong, electromagnetic, weak b. weak, electromagnetic, strong c. weak, strong, electromagnetic d. strong, weak, electromagnetic
A mass of 0.40 kg, hanging from a spring with a spring constant of 75.0 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through the equilibrium point? The starting displacement from equilibrium is 0.20 m
a. zero b. 2.7 m/s c. 3.9 m/s d. 3.4 m/s e. 0.55 m/s
The half-life of a radioactive substance is affected by
A) pressure. B) temperature. C) age. D) all of the above E) none of the above
A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?