Pariah Posted November 4, 2013 Report Share Posted November 4, 2013 Be prepared for a large number. That's bound to happen when you have the speed of light squared as a conversion factor. Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 4, 2013 Report Share Posted November 4, 2013 Actually, Planck's constant in the denominator is even worse. Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 watching a doco on Astronomy. Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 Since E = m c^2, and the energy of a photon is E = h c / lambda, with E = energy, m = mass, c = speed of light, h = Planck's constant, pick a wavelength and you can tell how many photons of that wavelength would be the energy equivalent of a given mass.Be prepared for a large number. Big numbers are better? back of the envelope, about 2 * 10^72 photons, if lambda = 500 nm (green). That's bound to happen when you have the speed of light squared as a conversion factor. Actually, Planck's constant in the denominator is even worse. big numbers? Astronomical! Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 4, 2013 Report Share Posted November 4, 2013 How many protons are there in the Universe? Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 infinite. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 4, 2013 Report Share Posted November 4, 2013 ... Huh. According to Wolfram-Alpha, the proton does not decay. Quote Link to comment Share on other sites More sharing options...
Pariah Posted November 4, 2013 Report Share Posted November 4, 2013 How many protons are there in the Universe? According to Sagan, the total number of protons, neutrons, and electrons in the universe is on the order of 10^80. So, assume that something like a third of those are protons, and you're in the ballpark. Quote Link to comment Share on other sites More sharing options...
Pariah Posted November 4, 2013 Report Share Posted November 4, 2013 ... Huh. According to Wolfram-Alpha, the proton does not decay. ...but it can be converted to a neutron through electron capture. (Why am I posting about nuclear physics at 1:49 in the morning?!) Quote Link to comment Share on other sites More sharing options...
Pariah Posted November 4, 2013 Report Share Posted November 4, 2013 Actually, Planck's constant in the denominator is even worse. You're right, of course. I hadn't considered that. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 4, 2013 Report Share Posted November 4, 2013 ...but it can be converted to a neutron through electron capture. (Why am I posting about nuclear physics at 1:49 in the morning?!) My guess would be because of you not sleeping. How's that new little life coming along? Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 ...but it can be converted to a neutron through electron capture. (Why am I posting about nuclear physics at 1:49 in the morning?!) the baby is keeping you awake? (a theory, needs scientific evidence) Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 You're right, of course. I hadn't considered that. the "Professor" usually is right. Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 4, 2013 Report Share Posted November 4, 2013 http://www.glasbergen.com/wp-content/gallery/cartoons/toon-1485.gif Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 4, 2013 Report Share Posted November 4, 2013 ...but it can be converted to a neutron through electron capture. (Why am I posting about nuclear physics at 1:49 in the morning?!) It happens. Besides, it could be worse. You could be frothing at the mouth about the Divergence Theorem. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 4, 2013 Report Share Posted November 4, 2013 Are we talking about The Pants Of Time here? Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 4, 2013 Report Share Posted November 4, 2013 Like Enforcer84, time needs no pants. Pariah 1 Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 4, 2013 Report Share Posted November 4, 2013 Then bloomers, perhaps? Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 5, 2013 Report Share Posted November 5, 2013 A case could be made for diapers (as opposed to diapirs). Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 5, 2013 Report Share Posted November 5, 2013 Diatoms. Ach, die atoms! Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 6, 2013 Report Share Posted November 6, 2013 Atoms cannot be killed. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 6, 2013 Report Share Posted November 6, 2013 But they don't have much of a life. Quote Link to comment Share on other sites More sharing options...
Cancer Posted November 6, 2013 Report Share Posted November 6, 2013 Depends. Noble gas atoms, you're right. Atoms in diatomic molecules, well, there's some. But those in e.g. polymers with lots and lots of carbon-on-carbon bonding or quantum tunneling across energy barriers or those in bulk metals sharing a sea of electrons among the whole population ... yowza. Quote Link to comment Share on other sites More sharing options...
L. Marcus Posted November 6, 2013 Report Share Posted November 6, 2013 I'm reminded of the nuclei that get to ride particle accelerators. Quote Link to comment Share on other sites More sharing options...
Bazza Posted November 6, 2013 Report Share Posted November 6, 2013 what common household items have lead*. i can't think of many, really only have one. *should be iron Quote Link to comment Share on other sites More sharing options...
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