Optoelectronics, Optics, Lights and Lasers
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Author Topic: i found this question to be kinda...simple?  (Read 307 times)
noodlenoggin
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« on: July 15, 2011, 04:43:43 AM »

here you go...10 easy points...at least two possible answers...

you're outside of a room.  in this room are two light bulbs: one stays on all the time, the other only comes on when the door is open.  how do you tell which light bulb is which?

try not to use set theory or venn diagrams for this solution.  easy algebra at the most is all that is needed here.  however...don't stop at one answer, give at least two.  push yourself to think outside the box.  there is more to day than dawn...the sun is but a morning star.

good luck.
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Matthew_Pengelly
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« Reply #1 on: July 15, 2011, 05:48:50 PM »

Smash one
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mirofish
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« Reply #2 on: July 17, 2011, 07:48:45 AM »

You go inside the room and both are turned on. You close the door and you'll know which one is which.
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Toaster_Strudel_
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« Reply #3 on: July 17, 2011, 12:03:35 PM »

peek through the window!
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Mystery_man
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« Reply #4 on: July 17, 2011, 02:01:31 PM »

This is easy. Wait a while, then quickly go inside the room and feel which one is hotter. The hot one is the always on one. The cool one is the one that switches on when the door is opened.
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Josh_Swanson
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« Reply #5 on: July 17, 2011, 04:03:15 PM »

Enter the room and close the door. Alternatively, wait a very long time before opening the door--the light that stays on all the time will have burned out. Alternatively, right after you open the door (without closing it) see which bulb is hot.

It's not clear to me what operations are allowed.
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