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2. A hydrogen atom in a state having a binding energy (the energy required to remove an electron) of 0.85 eV makes a transition to a state with an excitation energy (the difference between the energy of the state and that of the ground state) of 10.2 eV.
(b) What are the higher quantum number and lower quantum number of the transition producing this emission?
(a) What is the energy of the photon emitted as a result of the transition?
1. As shown in th figure, two blocks with masses m₁ and m₂ (m₁=2m₂) are connected by a massless string that hangs over a pulley of mass M (M=2m₁) and radius R. The string does not slip. Treat the pulley as a disk.
(b) Assuming that the system starts from rest, find the speed of m₁ after it has fallen by H.
VI. 閱讀測驗
Jack was walking down the street when he saw a big dog. The dog looked very, very mean. It kept on barking at Jack, so Jack stopped walking. Jack saw a woman standing near the dog, so he walked up to her and said, "Excuse me, does your dog bite?" The woman replied, "No, my dog doesn't bite." Hearing this, Jack continued walking. Suddenly the dog jumped up and bit Jack. Jack complained to the woman, "Hey! You said your dog doesn't bite!" The woman said, "It doesn't, but that's not my dog!"
50. What is the best title for this story? (A) A Big Misunderstanding (B) Friends (C) Happy Time (D) Birthday Party
49. Did the woman tell a lie? (A) No, he didn't. (B) No, she didn't. (C) Yes, she did. (D) Yes, he did.
48. Why did Jack stop when he saw the big dog? (A) Because the dog is too big. (B) Because Jack thought it was his dog. (C) Because the dog was running to him. (D) Because the dog was barking at him.
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