Brainteasers

[nordlead]

TruckOSaurus said:

Lem_Nx said:
Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (let's say in lamps which are on a regular table), each switch belongs to one bulb. All are off at the moment. It is impossible to see from one room to another. No help from anybody else is allowed.
How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?

 

- You switch one on and leave it on a certain time.

- You switch it off.

- You switch another one on.

- You enter the room.

- The one lit is the second you switch on. From the two closed one, the one that is hot is the first one you switched.

maybe they are CFL, and you didn't leave it on long enough to get warm