D Question 9 6 pts A circular disk has a surface charge density of o. If the radius of the disk is halved, and if the total charge on the disk is halved, what is the new surface charge density? 0 0/2 0 40 O 20 Previous Next Quiz saved at 5:35pm Submit Qui(?) Onesti Time Elapsed: Two very large planar sheets are charged with the same surface charge density + Attempt due: Feb ". They are separated by a distance 'd'. What is the magnitude of the electric 6 Minutes, 5 S field in the region between the sheets, and what is the electric field magnitude outside of the inner region? d Between Outside to Side View O Between: E = 4kno, Outside E = 0 O Between: E = 0, Outside E = 0 O Between: E = 2kno, Outside E = 2KTO O Between: E = 0, Outside E = 4knoQuestion 11 6 pts A closed container of gas is immersed in a temperature bath so that its temperature remains constant for all time. A piston attached to the container slowly compresses the gas so that the volume occupied by the gas is reduced by a factor of two. What happens to the internal energy Uint, the entropy S, and the Helmholtz free energy F? O Uint stays the same, S decreases, F increases O Uint increases, S increases, F increases O Uint stays the same, S increases, F increases O Uint increases, S increases, F decreases Previous Next Not saved Submit Quizuiz Instructions Question 12 6 pts A certain quantum well structure can exist in different energy states. The difference between the lowest energy state (the ground state) and the second to lowest energy state (the first excited state) is about 0.1 ev. The temperature of the structure is about 296K (so kBT = 0.025 eV). What will be the ratio of the number of atoms in the first excited state divided by the number of atoms in the ground state? (Please choose the closest answer) O About 1/4 O About 1 About 4 About 1/50 Previous NextQuestion 13 6 pts The change in enthalpy will always be positive under which conditions? O The internal energy decreases and the volume decreases. O The internal energy decreases and the volume increases. The internal energy increases and the volume increases. O The internal energy decreases and the volume decreases. Previous Next Not saved Submit Quizuiz Instructions Question 14 6 pts Imagine you have 3 packets of energy to distribute to 5 boxes (representing atoms). How many ways are there to distribute the three energy packets across the 5 boxes? 0 6 O 15 0 10 O 20 Previous Next