When photon absorption occurs in a hydrogen atom, the principal ...

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When photon absorption occurs in a hydrogen
  atom, the principal quantum number of the
  electron must
  a) decrease.
  b) remain the same.
  c) increase.
  d) become identical to that of a ground state electron.
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Question 2

A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30 below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60 above the horizontal. What is the magnitude of the average resultant force on the ball?
 a. 14 N
  b. 11 N
  c. 18 N
  d. 22 N
  e. 3.0 N

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Answer to Question 1

d

Answer to Question 2

b