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A gas of hydrogen like atoms can Pls tell Q14 and 15

A gas of hydrogen like atoms can
 
 
Pls tell Q14 and 15

Question Image
Grade:11

1 Answers

Bishal Raj Panda
34 Points
3 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 lamdaless than or equal to lamdaa 
(b)
E3-E2=68eV
(13.6) (Z 2) (1/4 -1/9) = 68 
Z=6
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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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