A gas of hydrogen like atoms canPls tell Q14 and 15
Sheel Ranjan Bajpai , 6 Years ago
Grade 11
Modern Physics> A gas of hydrogen like atoms can Pls tell...
1 Answers
Bishal Raj Panda
Last Activity: 6 Years ago
(a)
n(n-1)/2 =3
:. n=3
i.e. after excitation atom jumps to the second state
hence nf=3 ni=1,2
If ni = 1 then energy emitted is either equal to, greater than or less than the energy absorbed. Hence the emitted wavelength is either equal to, less than or greater than the absorbed wavelength.
Hence ni not equal to 1.
If ni = 2, then Ee greater than or equal to Ea . Hence lamdae less than or equal to lamdaa
(b)
E3-E2=68eV
(13.6) (Z 2) (1/4 -1/9) = 68
Z=6
©
lamdamin=12400/E3-E1 =12400/435.2=28.49
(d)
Ionization energy= (13.6) (6)2 = 489.6 eV
lamda=12400/489.6 = 25.33
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