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Respected Sir/Madam Please help me with Que. 3 as shown in the image.

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user8235304 | Student, Grade 11 | (Level 1) Valedictorian

Posted May 23, 2013 at 9:13 AM via web

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Respected Sir/Madam

Please help me with Que. 3 as shown in the image.

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted May 23, 2013 at 12:44 PM (Answer #1)

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When an atom goes back from its excited state to the ground state, it will omit photon of light which is equal to the change between two energy levels. We can manipulate the Rydberg formula for hydrogen atom in order to get the principal quantum number of the excited state.

`1/(lambda) = RZ^(2) (1/n_(1)^(2)-1/(n_(2)^(2)))`

Z = 1 (for hydrogen)

n1 = 1 

`1/(lambda) = R*1^(2) (1/1^(2)-1/(n_(2)^(2)))`

`1/(lambda) = R (1-1/(n_(2)^(2)))`

`1/(lambda* R) = (1-1/(n_(2)^(2)))`

`1/(n_(2)^(2)) = 1 -1/(lambda* R)`

`1/(n_(2)^(2)) = (lambda* R - 1)/(lambda* R)`

`n_(2)^(2) =(lambda* R)/(lambda* R - 1)`

`sqrt(n_(2)^(2) =(lambda* R)/(lambda* R - 1))`

`n_(2) = sqrt((lambda* R)/(lambda* R - 1))`

`n_(2) = [(lambda* R)/(lambda* R - 1)]^(1/2)`

 

The answer is letter A. 

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