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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Sep 2007 14:29:08 IST
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1. at what temperature will the DeBroglie wavelength of helium atom be 0.62angstrom units?? 2. what is the number of waves made by an electron moving in nth orbit of bohr atom?? 3. angular frequency of electron occupying 2nd bohr's orbit of he ion is? 4.how much will kinetic energy and total energy of electron in H atoms change if the atom emits a photon of wavelength 4860 Angstrom units. 5. Assertion: spectrum of He+ is expected to be simlar to line spectrum of H-atom........Reasoning: He+ is one electron system. what would be correct ans.?
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12 Sep 2007 15:50:39 IST
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Dear Sidney,
Please askl one question at a time for the experts to answer and post rest of the queries on a new page.
Cheers !
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12 Sep 2007 16:17:03 IST
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Answer to first question.
At any temp T the KE of He = 1.5kT
So its momentum p=sqrt(2*m*1.5kT)=sqrt(3kTm)
So lamda = h/sqrt(3kTm)
T=h^2/(lamda^2*3*k*m)
where h is plank's constant
lamda is given wavelength
k is Boltzman constant
m is mass of He atom
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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12 Sep 2007 18:20:10 IST
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He+ is one electron system but assertion is wrong.two spectrums never coincide
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13 Sep 2007 06:19:04 IST
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2nd q)
Radius of nth orbit = n^2/Z * 0.529
2 Pi r = n No. of wavelengths
and get the answer
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"If you win, you shall not have to explain and if you lose, you wont be there to explain"
~ Adolph Hitler |
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13 Sep 2007 06:22:04 IST
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V = d/t
Radius = 0.529 * 4 / 2 = r
Dist = 2 Pi r
Velocity = 2 * 10^8 * 1 / 2 = v
v = d/t
t = d/v
f = v/t
Angular freq = r/t
Correct????
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"If you win, you shall not have to explain and if you lose, you wont be there to explain"
~ Adolph Hitler |
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13 Sep 2007 07:47:46 IST
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frequency= -(2 E/h) z^2/n^3 = -(2*-13.6/6.626*10^ -34)2^2/2^3 =(4.105*10^34) /2 =2.053*10^34 /s do reply whether it is right or wrong
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don't walk as if u rule d world
walk as if u dont care who rules d world
-this is knw as attitude
B who u r and say wat u feel ......
coz those who mind don't matter ........
and those who matter dont mind ......... :)
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13 Sep 2007 22:38:16 IST
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1. at what temperature will the DeBroglie wavelength of helium atom be 0.62angstrom units?? 2. what is the number of waves made by an electron moving in nth orbit of bohr atom?? 3. angular frequency of electron occupying 2nd bohr's orbit of he ion is? 4.how much will kinetic energy and total energy of electron in H atoms change if the atom emits a photon of wavelength 4860 Angstrom units. 5. Assertion: spectrum of He+ is expected to be simlar to line spectrum of H-atom........Reasoning: He+ is one electron system. what would be correct ans.? ans2. n ans3. 1/2 ans5. since in He atom there are two electrons and after ionizing one electron there remains only one
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