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| A Physics Class | |
| 作者姓名： | 刘洪毓 |
| 作者单位： | 上海 |
| 摘 要： | MissRosetaughtphysicsinaLondonschool.Lastweekshewasex-plaining(讲解)tooneofherclassesaboutsound,andshedecidedtotestthemtoseehowsuccessful(成功的)shehadbeeninherwork.Shesaidtothem,“Now,IhaveasisterinWashington.IfIwascallingheronthetelephone,andatthesametimeyouwere20metresaway,andlistenedtomefromtheothersideofthestreet,whocouldhearwhatIsaidearlier,mysisteroryou,andwhy?Thecleverestboyatonceanswered,“Yoursister,MissRose,becauseelec-tricity(电)travelsfasterthansoundwaves(声波).”“Thatsveryg… |
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