A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes up.
B) It goes down.
C) It does not change.
D) It cannot be determined without knowing the volumes of the two pieces of wood.
C
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Which of the following will increase the capacitance of a parallel-plate capacitor? (There could be more than one correct choice.)
A) a decrease in the plate area and an increase in the plate separation B) a decrease in the potential difference between the plates C) an increase in the potential difference between the plates D) an increase in the plate area and a decrease in the plate separation E) an increase in the charge on the plates
The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n = 7 state?
a. 11.7 eV b. –11.7 eV c. 0.28 eV d. –0.28 eV e. 1.94 eV
What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its momentum is 4h/L?
a. 1 b. 4 c. 2 d. 8 e. 16
An electron and a proton are each released from rest in the same uniform electric field. The electron moves a distance delectron and the proton moves a distance dproton as each particle's kinetic energy increases by 1.6 eV. How do delectron and dproton compare?
a. delectron > dproton b. delectron = dproton c. delectron < dproton d. The answer depends on the direction of the electric field.