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I imagine he figures everybody knows Avagadro's number. The mass of a proton is the reciprocal.
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Richard Taylor
Sent from my iPad
On Jun 29, 2013, at 8:00 AM, brian whatcott <betwys1@sbcglobal.net> wrote:
On 6/29/2013 7:21 AM, Ken Caviness wrote:_______________________________________________
Question for JSD! What method do you use to almost immediately figure out the mass of the proton within 1% accuracy, so you haven't had to take the time and trouble to memorize it? Tantalizing hint (can be done in less time than it takes to ask the question), but I'm drawing a blank -- unless you remember other things more easily, and find m_p from them? (For example, the m_p/m_e ratio, or the nuclear magneton, or ....)/snip/
I am undoubtedly missing the thrust of Ken's question, but recalling Mp/Me is rather large, I can use the hydrogen mass as a good proxy for Mp.
Brian Whatcott Altus OK
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