A light bulb is hanging in a room. Outside
of the room there are three switches, of
which only one is connected to the lamp.
In the starting situation, all switches are
'off' and the bulb is not lit. If it is allowed
to check in the room only once to see if the
bulb is lit or not (this is not visible from the
outside), how can you determine with which
of the three switches the light bulb can be
Stacey Warren - Expert brainly.com
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NAHI!! i typed out a long solution for this one but lost it due to server restart. that alien feeling _/(o.O)\_
okay so a similar question was also posted by Prof Walter Lewin recently(albeit easier) (though I managed to cracked it there as well :p)
SO, name the three switches as A, B and C.
Now switch on A, say for about 15 mins. Then switch it off.
Now, switch on B. and immediately enter the room.
Now the following are results corresponding to what you find inside:
A- if the bulb is unlit, but the glass cover outside is hot due to radiations from the filament.
B- if the bulb is is lit.
C- if the bulb is BOTH unlit, as well as feels cold, or room temperature-like.
Am I right? :)