2022-05-31 06:43:27
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☞ A windowless room contains three identical light fixtures, each containing an identical light bulb or light globe. Each light is connected to one of three switches outside of the room. Each bulb is switched off at present. You are outside the room, and the door is closed. Before opening the door you may play around with the light switches as many times as you like. But once you've opened the door, you may no longer touch a switch. After this, you go into the room and examine the lights. How can you tell which switch goes to which light?
View Answer ☞ • Switch on switches 1 & 2, wait a moment and switch off number 2.
• Enter the room. Whichever bulb is on is wired to switch 1, whichever is off and hot is wired to switch number 2, and the third is wired to switch 3.
Obviously any combination would work. It doesn't have to be switches 1 & 2 you flick, any two will be fine, so long as you can remember which. There is another possible answer, this involves switching on 1, then waiting a while and switching on 2. When you get in to the room two of the bulbs will be on but one will be much hotter. It's valid, but there are several reasons why this is not as good.
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@BrainyRiddles
@Curiosity_Tea
1.9K viewsedited 03:43
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