The plates of a parallel-plate capacitor are maintained with constant potential by a battery as they are pulled apart. During this process, the amount of charge on the plates
A) must increase.
B) must decrease.
C) must remain constant.
D) could either increase or decrease. There is no way to tell from the information given.
B
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A basketball bounces off the floor. It is difficult to apply conservation of momentum usefully to the ball–earth system in this case because
A. The system is not isolated. B. A basketball does not bounce perfectly elastically. C. Air friction is significant. D. We can’t easily measure the earth’s velocity. E. The law doesn’t apply to contact interactions.
If light excites atomic hydrogen from its lowest energy level to the n = 12 level, what is the energy of the photons of this light?
A) 13.5 eV B) 32.2 eV C) 13.6 eV D) 0.0944 eV E) 1.13 eV
The planetary model of the atom was fundamentally flawed. It failed theoretically because
You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction b. always point opposite to each other c. sometimes point in the same direction, and other times point opposite to each other d. depend on the way the ball is thrown e. depend on the mass of the ball