Alright, here’s the solution to the Three Switches and a Light Bulb riddle!
Step 1: Use Heat and Light to Your Advantage
Since you cannot see inside the room before opening the door, you need to use both the light and the heat from the bulb to figure out which switch controls it.
Step 2: The Process
Turn ON Switch #1 and leave it on for a few minutes.
Turn OFF Switch #1 and immediately turn ON Switch #2.
Leave Switch #3 OFF the entire time.
Now, open the door and check the light bulb!
Step 3: Identify the Correct Switch
If the bulb is ON → It is controlled by Switch #2 (since you left it on).
If the bulb is OFF but warm to the touch → It was controlled by Switch #1 (because it was on for a while but turned off before you entered).
If the bulb is OFF and cold → It is controlled by Switch #3 (because it was never turned on).
Final Answer:
By using both heat and light, you can correctly determine which switch controls the bulb with only one chance to open the door! 🔥💡