A car with tires whose radius is 35 cm is traveling along a highway at 29.8 m/s. What is the angular speed of the tires?
A) 90 rad/s
B) 85 rad/s
C) 80 rad/s
D) 75 rad/s
E) 70 rad/s
B
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It is desired to produce a p-type semiconductor out of Group IV silicon that will have an electrical conductivity of 100 (?·m)-1 at room temperature. Assume that the mobility of electrons in silicon is equal to 0.10 m2 /V·s, and the mobility of holes is equal to 0.03 m2 /V·s. You may assume that this semiconductor is in the extrinsic range of operation at this temperature.
(a) What is the required density of holes in the valence band? (b) What concentration of substitutional acceptor atoms will produce the desired electrical conductivity, assuming that an element from Group III is substituted for the silicon atoms?
Visible sunspots lie in the
A) chromosphere. B) transition zone. C) corona. D) radiative zone. E) granulation in the photosphere.
Results from the Phoenix lander and Curiosity rover suggest that the positive result from the Viking Labeled Release experiment was probably due to
A) the destruction of organic molecules by oxygen released when perchlorates in the soil decomposed on heating B) terrestrial contamination from the robotic arm which took the samples C) a malfunction in the experiment D) high levels of radioactivity in the soil
If the scattering angle of the light in Compton's scattering experiment is 90°, what is the change in the wavelength of the light?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.22 × 10-12 m B) 2.42 × 10-12 m C) 3.65 × 10-12 m D) 4.85 × 10-12 m