scott wrote:
>> Wolfram Alpha tells me [EVENTUALLY!] that a 200 Hz sound has a 
>> wavelength of about 170 cm.
>>
>> Question: Since the doorway to be bedroom is less than 170 cm wide, 
>> does that mean those waves can't leave the room?
> 
> No.  Anyway sound goes through solid things as well as air so even if it 
> couldn't go through the gap it would go through the wall itself.

OK... but presumably the velocity of sound inside a brick wall is 
different to free air, so there would be some kind of diffraction effect?

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