24. How many quantum states are there in the nth principal quantum level of the hydrogen atom? (A) n-1. (B) n². (C) 2n². (D) n²-1.

4. A point-like bug of mass m lies on the rim of a uniform disk of mass M that can rotate freely about its center. Initially the bug and disk rotate together with an angular velocity ω₀. Then the bug walks half way to the center of the disk. What is ratio of the new kinetic energy of the system to its initial kinetic energy? (A) (4m+2M)/(m+2M) (B) (m+2M)/(4m+2M) (C) (2m+4M)/(2m+M) (D) (2m+M)/(2m+4M)

24. How many quantum states are there in the n^th principal quantum level of the hydrogen atom?
(A) n-1.
(B) n².
(C) 2n².
(D) n²-1.

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