動動腦-1

 

今天來活動一下腦筋吧!

你在一個房間, 房間內有3個開關, 分別控制隔壁房間的3個燈泡, 遊戲的規則是一旦你把房間門打就不能再碰開關了. 

請問在這樣的前提下, 你要怎麼確定哪一個開關控制(對應)到隔壁房的哪一個燈泡?

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Answer: Turn on the first two switches. Leave them on for five minutes. Once five minutes has passed, turn off the second switch, leaving one switch on. Now go through the door. The light that is still on is connected to the first switch. Whichever of the other two is warm to the touch is connected to the second switch. The bulb that is cold is connected to the switch that was never turned on.

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上面是原文答案, 把它放上來一方面是製造點間隔以免一下子就看到答案, 另一方面也可以順便練一下閱讀能力.

答案:

打開其中兩個開關, 等五分鐘後關掉其中一個開關, 然後走到隔壁有燈泡的房間去, 不用想也知道亮著的那個燈泡是由哪個開關控制. 剩下兩個沒亮的燈泡中, 表面溫度是冷的燈泡是連接到剛剛沒有開啟的那個開關, 剩下你就知道比較熱的燈泡是連接到哪個開關了.