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![[Post New]](/templates/default/images/icon_minipost_new.gif) 9 Jan 2008 15:11:52 IST
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a hydrogen atom at rest undergoes a trasition 4 n=3 to n=1 its recoil speed is
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9 Jan 2008 15:57:25 IST
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According to Rydberg's Equation....
Wave Number = 109677 [1 - 1/9] = 109677 *8/9 = 97490
Now momentum of photon = E/c = hc*Wave number/c = h*Wavenumber = 97490*6.67*10^-34 = Sumthin (x)
According to law of conservation of momentum, this would be the momentum of H atom
So recoil speed = x/ Mass of H atom
= x/ Mass of proton + mass of electron
= x / 1837*mass of electron
I hpope its clear......
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