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Orchid XP v8 wrote:
> Question: Since the doorway to be bedroom is less than 170 cm wide, does
> that mean those waves can't leave the room?
Sound waves are longitudinal.
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l1b.html
Hence, they'll fit thru any hole big enough to not diffract the wave as it
goes through the hole.
Light is (essentially) a traverse wave[1], which is why your microwave oven
has little holes in the screen so you can see in without getting fried. It's
working like you think - the light has a frequency high enough that it fits
thru the holes, while the microwaves are bigger and bounce off.
On the other hand, radio waves are *so* big they go thru lots of inter-atom
holes at once (like a wave going past a row of pylons holding up a pier) and
hence will go thru walls where visible light won't.
[1] Of course, it's not a wave, but the math makes it have many of the same
properties as a wave, and this is one of them. That's why polarizers work
such as in sun-glasses. You can't polarize a longitudinal wave.
--
Darren New, San Diego CA, USA (PST)
"We'd like you to back-port all the changes in 2.0
back to version 1.0."
"We've done that already. We call it 2.0."
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