Who Would Hear Me First?
谁会先听到我？
Professor Wang is a physics teacher in Beijing. Once she was explaining to one of her classes about sound. She decided to test the students to see how well they had understood her. “I have an uncle in Xinjiang,” she said. “Suppose I was calling him on the phone from here, and at the same time you were 25 metres away, listening to me. Who would hear me first, my uncle or you — and for what reason?”
王教授是北京的一名物理老师。有一次，她正在向她的一个班级解释声音。她决定测试学生们对她的理解程度，说：“我在新疆有一个叔叔。假设我在这里给他打电话，同时，你在25米外，听我说话。谁会先听到我的话，我的叔叔还是你？原因是什么？”
Ma Hua at once answered, “Your uncle, Professor, because sound-waves travel slower than electricity. “
马华立刻回答：“你叔叔，教授，因为声波行驶速度比电慢。“
“Good, “ said the professor. But then another boy raised his hand.
“很好，”教授说。但随后另一个男孩举起了手。
“Yes, Limin?” said Professor Wang.
“李敏？”王教授说。
“Of course your uncle would hear you first,” Limin said, “but that’s because of the time difference. When it’s nine o’clock here, it’s seven o’clock in Xinjiang.”
“当然是你叔叔会先听到你的声音，”李敏说，“但那是因为时差。这里是九点，新疆是七点。”
网友评论