18
Dec
09

Solutions to WU’s puzzles and riddles : Light Bulb and Switches (medium)


3 Bulbs

I am trying to find all the solutions and put them together at a single place, So feel free to add comments and if you have a solution please do post. Cheers …🙂

Here is the puzzles link : http://www.wuriddles.com/

Question : You are in a room with three light switches, each of which controls one of three light bulbs in the next room. Your task is to determine which switch controls which bulb. All lights are initially off, and you can’t see into one room from the other. You are allowed only one chance to enter the room with the light bulbs. How can you determine which light switch goes with which light bulb?

My Solution : For this solution, we need to use some thermal laws …..😛 , sounds funny, but there is no other way. Here we are given 3 bulbs and 3 switches and we can go inside only once. Lets say the Bulbs are named B1,B2,B3 and the corresponding switches are S1,S2,S3. Now what we do is, we switch on the switch S1 and wait for half an hour. After that , we switch on S2 and go inside. After going inside, the bulb which is glowing is B2 obviously.  And now hold the other 2 bulbs. And you can observe that one of the bulb will be hot because it was switched on and kept for half an hour. So that bulb is none other than our S1 and the remaining bulb is S3 …🙂


5 Responses to “Solutions to WU’s puzzles and riddles : Light Bulb and Switches (medium)”


  1. 2 nomina grace
    October 11, 2012 at 12:07 am

    May I borrow that lightbulb picture?

  2. April 7, 2013 at 2:49 am

    Somebody necessarily help to make seriously articles I’d state. That is the very first time I frequented your website page and so far? I surprised with the analysis you made to make this actual put up amazing. Fantastic task!

  3. September 26, 2016 at 3:19 pm

    引っ越しをして、一人暮らしが始まる時には、単身用のサービスを利用する方が得になるケースが多いです。また、大きい家具や家電を新しく購入するのであれば、引っ越し業者に依頼をせずとも、引っ越しすることができるかもしれません。

    今度から一人暮らしを始めるのに、誰にも頼らずに自分一人で引っ越しをしたのです。バカげた事をしてしまいました。ヤマトの単身引っ越しパックが利便性があると友人から聞きました。独り身での引っ越しは、自身と家族だけでやった方が費用が安く済むし節約できると思うかもしれません。

    でも、実際は大物を運ぶのも骨が折れますし、とても時間も労力もかかるのです。しからば、引っ越し業者の単身パックを依頼した方が安く済みますし時間も手間もかからないので、こちらの方が良いです。

  4. September 30, 2016 at 12:17 am

    面倒な引っ越し作業に時間を使いたくないという方は、ぜひアート引越センターを使ってみて下さい。面倒な準備作業を計画通りに進みます。私が初めての引っ越しを経験した時は「引っ越しのサカイ」さんにお願いしました。

    テキパキと計画通りに引っ越しを進めることも重要ですが、常に頭に置いておきたいのは出費を抑えることです。

    大体の相場が分かったら、複数の業者に見積もりをお願いして、相場より安くて金銭的な負担が少なく、サービスに力を入れているような業者を選択するのが充実した引っ越しになるポイントです。


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