The number of states in the He+ ion corresponding to the principle quantum number n = 5 are
a. 18
b. 25
c. 50
d. 9
e. 11
c
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When water changes from solid ice to a liquid, it
A) loses energy. B) gives off energy. C) gains energy. D) radiates energy.
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A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?
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A 51 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height
The time interval for a round trip is 3.00 s. In this situation, the average force exerted on the ball during contact with the plate is closest to: A) 3,000 N B) 1,500 N C) 2,490 N D) 2,000 N E) 3,500 N