On Sat, 01 Aug 2009 14:29:00 +0100, Orchid XP v8 <voi### [at] devnull> wrote:

>Listening to some music, I observe that most of the drumbeat sounds 
>appear to be in the region below 200 Hz.
>
>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? Or does the fact that it's 
>more than 170 cm tall negate that?

Sound waves are compressional (is that a word?) and rely on a medium to travel
in. 
So tell your mother that she can't possibly be hearing them. ;)
-- 

Regards
     Stephen

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