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K.Haught
Post subject: Darkroom riddle  PostPosted: Oct 27, 2005 - 10:00 AM





General
Darkroom

There is a lamp inside a photography darkroom. When the darkroom door is closed, it is impossible to tell from outside the room whether or not the lamp is on. There are two switches outside the door of the darkroom. One or both of the switches may control the lamp. It also could be that neither of the switches control the lamp. All you know is that the light bulb is currently off and that the lamp and bulb are in working condition. The darkroom door is closed and once you open the door you cannot touch either of the switches. If you can only open the dark-room door one time, how can you tell which switches, if any, control the lamp?


                    
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Cally
Post subject:   PostPosted: Oct 27, 2005 - 10:37 AM





General
Switch on the first switch and leave on for about ten minutes ... Then turn off. Switch on the second switch and open the darkroom door ...... quickly touch the bulb (Lightly, as it may be hot).

If the lamp is on and the bulb is quite hot ... both switches work the lamp.

If the lamp is on and the bulb is cool ... the second switch controls the lamp.

If the lamp is off and the bulb is hot ... switch one controls the lamp.

If the lamp is off and the bulb is cool ... neither switch controls the lamp.


                    
 
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