On 2-8-2009 11:22, Stephen wrote:
> 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. ;)

Because Andy's mum is not a medium?

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