The difference in energy levels that exists between the valence band and the conduction band is called
a. semiconductor region.
b. spark gap.
c. energy gap.
d. covalent gap.
Ans: c. energy gap.
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The figure shows the Sun and pairs of sunspots. One could say that there is really a 22-year sunspot cycle because
Why isn't the Andromeda galaxy's center a strong source of energy?
A) It only appears not to be because most of the energy is released towards a direction away from our Milky Way. B) It really is; dark matter in the space between the Andromeda Galaxy and the Milky Way is blocking our measurement of the total energy. C) Only a relative trickle of gas falls into the black hole. D) It is a very old black hole that has already converted most of its internal mass to energy. E) Andromeda is a small elliptical galaxy that supplies very little free gas to the zone near the black hole.
If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
a.
20 W
b.
17 W
c.
12 W
d.
31 W
e.
6.0 W
An initially installed flywheel can store 106 J of kinetic energy when rotating at 300 rad/s. It is replaced by another flywheel of the same size but made of a stronger material. If its mass is the same as that of the original, and it is now capable of achieving a rotational speed of 425 rad/s, what maximum energy can be stored?
a. 2.01E+6 J b. 1.66E+3 J c. 1.73E+5 J d. 1.00E+6 J