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When a phone is inside a microwave oven and if we call it over Wi-Fi, the phone doesn't receive the call, because Wi-Fi and the microwaves generated in the oven have the same frequency and there is a mesh-like thing that blocks the microwaves.

But, since the void space of my trousers fabric have an even smaller diameter than those mesh holes, how is it that we can receive Whatsapp calls when the phone is in our trousers?

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    $\begingroup$ Are your trousers made of metal? $\endgroup$
    – Bob D
    Commented Oct 18, 2019 at 7:41
  • $\begingroup$ i hav posted the correct answer $\endgroup$
    – Sandeep
    Commented Oct 27, 2019 at 17:17
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    $\begingroup$ I'm sorry but I don't agree with your "correct answer". Microwaves pass through cloth with or without holes unless the cloth has metal in it. $\endgroup$
    – Bob D
    Commented Oct 27, 2019 at 17:55
  • $\begingroup$ Please use standard punctuation and capitalization. $\endgroup$
    – user4552
    Commented Oct 27, 2019 at 20:09

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Metal blocks microwaves. Cloth does not because it is not metal.

The purpose of the holes in the microwave door screen is to allow visible light to pass through so the user can view the oven contents. Microwaves don’t pass through the holes in the metal mesh screen of the door because the diameter of the holes is about a millimeter and is much less than the wavelength of the microwaves, which is about 120 mm. The wavelength of visible light, on the other hand, is much smaller than the holes in the screen which therefore allows light to pass through.

Hope this helps

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  • $\begingroup$ but holes in cloth are even small $\endgroup$
    – Sandeep
    Commented Oct 18, 2019 at 10:14
  • $\begingroup$ @Sandeep Reddy But in order to block microwaves an object must both be made of metal and have small hole. Cloth is not made of metal as I said in the first sentence of my answer $\endgroup$
    – Bob D
    Commented Oct 18, 2019 at 10:22
  • $\begingroup$ @SandeepReddy The holes in the mesh are so we can see inside. The holes don't block the microwaves. $\endgroup$ Commented Oct 20, 2019 at 16:40
  • $\begingroup$ @AaronStevens Not sure of your point here. Perhaps it's the term "block". But microwaves do not pass through the holes because the diameter are much less less than the microwave wavelength, whereas visible light (for viewing) does because the hole diameter is much greater than the wavelength of visible light. $\endgroup$
    – Bob D
    Commented Oct 20, 2019 at 16:44
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    $\begingroup$ @AaronStevens Ah, I see now. I probably should have pointed out the purpose of the holes in my answer. I think I will update it. Thanks. $\endgroup$
    – Bob D
    Commented Oct 20, 2019 at 16:59

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