Can you explain how in that site above it shows waves as straight lines AND circles radiating from a point somewhere? Also how come when you look up a wave someplace else it has amplitude, I'm finding it difficult to build up a picture of waves, especially radio waves, as obviously they can't...
When the wave goes through a gap, does the whole of the wave get through, so no part of the mobile phone conversation is lost?
When you think about it it is strange, a hole less then the wavelength, and it gets though intact? Is that what you're saying?
Diffraction
Yes he did say "diffraction". Now back to microwaves like mobile phones and houses. Why does cell phone rad. not penertrate brick, and what part of the diffraction principle enables them to do so? The bending around objects, or the spreading of waves through a gap or apature...
Refraction
Can you explain how this refraction works, this phen. that allows radio waves to seemingly pass through things like brick. A website perhaps, with some images?
For long wavelengths like radio is dense material better to block, or shield, as it is for short wavelengths like x-rays?
You can block out the photons of the visible part of them electro-magnetic spectrum by pulling the curtains closed, so how come radio waves like your AM radio, cell...