True or False? From the definition of capacitance C = Q/?V, it follows that an uncharged capacitor has a capacitance of zero
1.True
2.False
2
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You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?
a. about a mile b. half a mile c. a tenth of a mile d. none of the above
A main-sequence star more massive than the Sun:
A) will have less density than the Sun. B) will have more luminosity than the Sun. C) always undergoes proton-proton chain reactions to generate energy. D) always undergoes carbon-nitrogen-oxygen cycle to generate energy.
A block of material of mass m and specific heat c falls from height h and reaches speed v just before striking the ground. Its temperature is measured immediately after it strikes the ground. If we ignore any change in temperature owing to interaction with the air, the change in temperature of the block of material is
A.
.B.
.C.
.D.
E.
Matter Waves: If the de Broglie wavelength of an electron is 2.4 ?m, what is the speed of the electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 3.0 × 102 m/s B. 2.5 × 105 m/s C. 1.7 × 103 m/s D. 8.3 × 106 m/s