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When a phone is inside microwave oven and if we call it using wifi the phone doesnt recive call as frequency of wifi is same as frequency of wave generated in oven as there is a mesh like thing which blocks waves but how can we recive same whatsapp call when phone is inside trousers as holes in it are still smaller than mesh holes?

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    $\begingroup$ Are your trousers made of metal? $\endgroup$ – Bob D Oct 18 '19 at 7:41
  • $\begingroup$ no its made of cotton $\endgroup$ – Sandeep Oct 18 '19 at 9:47
  • $\begingroup$ my doubt is that how can same waves pass through holes that are less in radius of cloth but not through the holes of microwave mesh? $\endgroup$ – Sandeep Oct 18 '19 at 9:49
  • $\begingroup$ i hav posted the correct answer $\endgroup$ – Sandeep Oct 27 '19 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 Oct 27 '19 at 17:55
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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 Oct 18 '19 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 Oct 18 '19 at 10:22
  • $\begingroup$ @SandeepReddy The holes in the mesh are so we can see inside. The holes don't block the microwaves. $\endgroup$ – BioPhysicist Oct 20 '19 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 Oct 20 '19 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 Oct 20 '19 at 16:59

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