1-The energy of a photon emitted when an electron underwent a transition to n =

Question

1-The energy of a photon emitted when an electron underwent a transition to n = 1 energy level was 2.092x10-18 J. What was the initial energy level for the electron?

Options ( 2,3,4,5,6,7)

2-

When performing a flame test you are told that a rubidium solution will produce a violet color, but an actual test of the solution (using the method described in the manual) produces a yellow color. Select the potential source(s) of error.

Select all that apply.

Please I need correct answers as soon as possible, thank you

Explanation / Answer

1) we have formula   E = (2.179 x 10^-18 J ) ( 1/n1^2 - 1/n2^2)  

where E is energy fo exciation = 2.092 ,   n1 = 1 ( ground state) , we find n2

2.092 x 10^-18 = 2.179 x 10^-18 J ( 1/1^2 - 1/n2^2)

n2 = 5

Thus answer is 5

2) Yellow color is observed instaed of violet indicates

There is contaminant in rubidium solution

Hence answer A

( since different metals gives different colours , yellow colour is actually given by sodium)

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