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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Jun 2007 21:02:25 IST
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According to Bohrs theory the electronic energy of H in nth orbit is given by
En=(-21.76*10-19 J)(1/n2)
Calculate the longest wavelength of light that will be needed to cause this transition.
(Ans: 20.5 *10-7m)
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30 Jun 2007 21:08:07 IST
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Hi! Do specify transition from which orbit to which orbit.
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30 Jun 2007 21:10:09 IST
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hi Nithy
tats what the problem is............no info. is given about the transition
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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30 Jun 2007 22:56:43 IST
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I THINK THE TRANSITION IS FROM N=2 TO N=1 .......
BUT STILL I'D LIKE TO CONFIRM....
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1 Jul 2007 09:50:03 IST
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longest wavelength or shortest energy is possible only for the transition from 2-1, but the answer dosent tally with the answer given
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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2 Jul 2007 09:51:40 IST
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longest wavelenth means shortest energy and so transition is from 2 to 1
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9 Jul 2007 19:45:14 IST
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21.76..... whatever b is given in the question we have to first convert in eV THAT'S COME OUT TO B BETWEEN 10.2 TO 13.6 eV THEREFORE IT CORRESPONDS TO LYMAN SERIES NOW WE KNOW THAT LONGEST WAVELENGTH FOR LYMAN SERIES COME AT TRANSITION n1=1 & n2=2 PLS REPLY IF MY EXPLANATION IS CORRECT
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manan salman khan |
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12 Jul 2007 17:44:25 IST
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Q) According to Bohrs theory the electronic energy of H in nth orbit is given by
En=(-21.76*10-19 J)(1/n2)
Calculate the longest wavelength of light that will be needed to cause this transition.
Ans) Here longest wavelength is required only when minimum energy is required, Thus we should consider transition from n = 1 to n = 2 So energy change involved is = E2 - E1 = (-21.76*10-19 J)(1/4) - (- 21.76*10-19 J)(1/4) so wavelength =  = hc / (E2 - E1) where h = plankcs constant c = speed of light. Substitute the values to get the results.
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