Microwave oven:


Do you have a microwave at home? Do you know how it works? If you think you do, then you are wrong.

But you can determine the frequency of your household microwave oven easily. There is a very easy way. Can you guess it?

There is another way, which requires some chocolate.

Take a big bar of chocolate, and keep it in your oven for 15 seconds. When you take it out, you'll see that there are some regions which are 'badly' molten (yummy!). The distance between consecutive molten regions is 6cm.

So, whats the frequency?

P.S: you need to switch off the rotation for the microwave for this.

30 comments:

  1. shaanFebruary 6, 2011 at 10:42 PM

    cD/(d*0.06)?

    but i'll need D/d for that....

    ReplyDelete
  2. AnonymousFebruary 6, 2011 at 10:47 PM

    This comment has been removed by a blog administrator.

    ReplyDelete
  3. AnujFebruary 6, 2011 at 10:51 PM

    i saw that show too...

    ReplyDelete
  4. AnonymousFebruary 6, 2011 at 10:54 PM

    was my answer correct? and the explantion?

    ReplyDelete
  5. AnujFebruary 6, 2011 at 11:29 PM

    can't remember the answer,,,but the explanation was perfect.

    ReplyDelete
  6. AnonymousFebruary 7, 2011 at 12:29 AM

    is it something like where node of electromagnetic wave will fall, heating would take place there. Here lambda=6cm. Is it correct????Speed is same as electromagnetic wave.
    now, c=lambda*f

    bhaiya, please tell if it is correct else I will think something else

    ReplyDelete
  7. ShivankerFebruary 7, 2011 at 9:05 AM

    is it 2.5 GHz??

    ReplyDelete
  8. Tushar GuptaFebruary 7, 2011 at 12:28 PM

    whats d explanation akash/anuj?

    ReplyDelete
  9. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 4:48 PM

    I am also getting 2.5 GHz

    ReplyDelete
  10. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 4:49 PM

    Well done Shivanker

    ReplyDelete
  11. AnonymousFebruary 7, 2011 at 6:19 PM

    @tushar, I have already given the explanation as well as the answer.
    node=lambda/2
    1GHz=10^9

    ReplyDelete
  12. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 6:19 PM

    This is one of the best questions posted by Anuj bhaiya in physics.Thank you very much for these wonderful concepts.Hat's off to you.

    ReplyDelete
  13. AnujFebruary 7, 2011 at 8:17 PM

    so what about the 'very easy' way?

    ReplyDelete
  14. ShivankerFebruary 7, 2011 at 8:41 PM

    ask the manufacturers?? :D

    ReplyDelete
  15. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 9:01 PM

    This comment has been removed by the author.

    ReplyDelete
  16. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 9:02 PM

    This comment has been removed by the author.

    ReplyDelete
  17. ShivankerFebruary 7, 2011 at 9:02 PM

    @ mr. anonymous:

    i think it will be the antinodes where maximum heating shall occur.. :-/

    ReplyDelete
  18. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 9:03 PM

    This comment has been removed by the author.

    ReplyDelete
  19. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 9:05 PM

    The frequency of a microwave is on the sticker backside of the oven.It also present on the backside my microwave oven.There the value of frequency is 2450 MHz.

    ReplyDelete
  20. AnujFebruary 7, 2011 at 9:12 PM

    Hi ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○

    The arena for 'The Game of Deleting Comments' is in the last question. The game is still on!!!

    Anti-nodes is correct. 2.450GHz is close to our estimate.

    ReplyDelete
  21. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 10:13 PM

    IS MY ABOVE ANSWER FOR THE EASIEST WAY TO FIND FREQUENCY OF MICROWAVE OVEN BY LOOKING ITS VALUE BACKSIDE OF IT CORRECT??

    ReplyDelete
  22. AnujFebruary 7, 2011 at 10:33 PM

    yes it is...

    the CAPS make it sound like you're threatening me.. :P

    ReplyDelete
  23. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○February 7, 2011 at 10:34 PM

    yupiii

    ReplyDelete
  24. AnonymousFebruary 7, 2011 at 11:53 PM

    bhaiya or any other, please explain why antinodes because wave would be lying on the chocolate at nodes so, heating would occur there.

    ReplyDelete
  25. ShivankerFebruary 8, 2011 at 10:46 AM

    a microwave oven uses the property that microwaves interact with liquid(generally trapped water) molecules by making them vibrate.. now consider a wave travelling "through" the choco-bar.. jahan antinode hogi vahin to vibration due to E&B fields zyada hogi!

    hope m nt wrong..! :)

    ReplyDelete
  26. AnonymousFebruary 8, 2011 at 12:19 PM

    thats right shivanker.
    btw, another interesting thing about microwaves is that if wee keep something metallic there which is pointed, say a fork or a crushed aluminium foil, we can see sparks inside the microwave as the voltage is higher than breakdown voltage of air.
    but if we say keep a bowl or something, there are no sparks. does anyone have a reason for this. i am myself not aware of the answer.

    ReplyDelete
  27. ShivankerFebruary 8, 2011 at 1:37 PM

    maybe just due to EM disturbance, charges get concentratd at d corners..(as they DO have a sort of "tendency" to accumulate at corners)
    and we know that at d corners, surface charge density is really, really high compared to normal curvilinear regions..
    hence corona discharge..
    i might be wrong though..


    P.S.: a correction in my previous post.. "...consider a STANDING WAVE through the choco-bar..."

    ReplyDelete
  28. Tushar GuptaFebruary 8, 2011 at 5:29 PM

    @anonymous: yeah thanx. its just dat i generally tend 2 ignore things written or said by anonymous ppl

    ReplyDelete
  29. AnonymousFebruary 8, 2011 at 7:09 PM

    :)

    ReplyDelete
  30. Moiz raza ashraf aliJune 5, 2018 at 5:29 PM

    I wanted to thank you for this great read!! I definitely enjoying every little bit of it I have you bookmarked to check out new stuff you post. best microwave oven in india 2018

    ReplyDelete

Subscribe to: Post Comments (Atom)