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A friend was sitting near another's ringing mobile phone, stoically ignoring the noise. When I advised him to cover the dynamic with a finger, he replied that it may break it.

Is it really so? I think the energy should be dissipated in finger/casing and is too weak to break anything anyway.

Managed to find a reference with [remotely] similar opinion, although here the aperture is covered to make it louder as opposed to silencing it http://www.e-katalog.ru/opinion_ie.php?resolvedName_=NOKIA-1280 "И динамик не стоит на обратной стороне заклеивать или закрывать пальцем,на много проще перевернуть телефончик обратной стороной к уху и слышимость становится просто-супер!А заклеенный динамик со временем испортится." -> "And you should not block the dynamic on the reverse side with finger or with duct tape. Simply turn around the device and lean the back side your ear - audibility is superb. And glued (with a duct tape) dynamic will eventually spoil."

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    Welcome to Skeptics! We want to focus our attention on doubtful claims that are widely held or are made by notable people. Please provide some references to places where this claim is being made. – Oddthinking Sep 12 '11 at 3:20
  • This one looks certainly not widely held/notable. (I thought it is about any doubtful claims that can be confirmed or rejected). – Vi0 Sep 12 '11 at 9:07
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    What is the "aperture" of a mobile phone? – Sklivvz Sep 12 '11 at 15:12
  • @Sklivvz - I think they mean a speaker opening, using the camera term to denote it (In optics, an aperture is a hole or an opening through which light travels). – user5341 Sep 12 '11 at 15:33
  • @dvk, it could also be the mic, at least that's what I understood (also, is it the same thing as the "dynamic")? – Sklivvz Sep 12 '11 at 16:33

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