Linked Questions

15
votes
2answers
4k views

Why are electromagnetic waves not able to pass through a hole with a diameter smaller than the wavelength? [duplicate]

I am doing research on Faraday cages for school, and I want to know how it works. Faraday cages can have holes in them, and if the diameter is smaller than the wavelength of waves you want to block, ...
3
votes
3answers
1k views

Physical reason why the wavelength defines the minimum sized opening an electromagnetic wave can pass through? [duplicate]

I'm having a hard time understanding why wavelength restricts a wave from passing through a hole smaller than that wavelength. For example on a microwave, the front grating prevents the microwaves ...
2
votes
0answers
1k views

Why there is no diffraction in the microwave oven's door? [duplicate]

I thought that hole smaller than wavelength causes strong diffraction. Holes in door of the microwave oven 100 times smaller than wavelength. Why does it block radiation?
6
votes
6answers
5k views

What happens to waves when they hit smaller apertures than their wavelenghts?

I was wondering this for quite a long time now. Let's say you have a water wave (like ripples, not the ones you see during tsunamis) with wavelength 10 m. Imagine you put a boundary with an opening of ...
8
votes
2answers
2k views

How can radiation be a transverse wave? Does light really resemble a rope? How can a 3D field be a medium for non-spatial 1D waves? Need mental model

I understand longitudinal waves. For example, I've got a clear mental modal of air waves: a slice of air becomes overcompressed, then the slice next to it becomes overcompressed and the first slice ...
1
vote
3answers
2k views

2.4Ghz microwaves have a 12cm wavelength. How do microwave ovens leak radiation, since any gap in the shielding is much smaller than that wavelength?

I've read (I think on wikipedia, but I can't find the reference) that microwave oven leakage is often due to faulty seals on the door. Given that any gap in the door is going to be far smaller than 10%...
4
votes
4answers
2k views

Sound diffraction through a single slit

When sound waves diffract through a single slit, do they produce an interference pattern which is mathematically identical to that of light waves in the corresponding experiment?
1
vote
2answers
813 views

What happens in a microwave oven with hole in the shielding?

We have a question on cooking asking about the safety of a microwave with a hole in it. The question isn't totally clear whether the hole has actually penetrated shielding or just the plastic wall of ...
1
vote
0answers
220 views

Microwave Oven Mesh Screen

I was looking at my microwave the other day and I thought that the metal mesh screen might be acting like a set of perpendicularly oriented polarizers. Other explanations I've heard on how this screen ...
2
votes
3answers
103 views

What happens to the diffraction pattern of light as an aperture becomes infinitely small?

Will the point source according to Huygens principle start radiating backwards with nothing to cancel it out? Will it be a complete sphere if light passes through an infinitely small aperture?
0
votes
2answers
51 views

Does diffraction happen from small slit width than its wavelength? [duplicate]

I always learnt in school that diffraction and interference happens if the slit width is of the order of wavelength. But what if the slit width is less than that of wavelength. Does diffraction ...