What is longest wavelength of paschen series of li2+ ion

1.	What is longest wavelength of paschen series of li2+ ion
Answer» ANSWER: THE ANSWER TO THIS QUESTION IS 16/(7R) WHERE R IS RYDBERG CONSTANT Explanation: In the paschen series the ELECTRONS have a transition from various electronic levels to a lower energy level of n=3. To compute the wave number that is the inverse of wavelength we use the FORMULA 1/λ=RZ^2([1/n1^2]-[1/n2^2]) here n1=3 and n2=4 as the transition between two successive ORBITS involves low energy difference thereby huge wavelength from the formula E=hc/λ thereby computing 1/λ=R×9[{1/9}-(1/16)] 1/λ=R×7/16 ⇒λ=16/7R

Answer»

THE ANSWER TO THIS QUESTION IS 16/(7R) WHERE R IS RYDBERG CONSTANT

Explanation:

In the paschen series the ELECTRONS have a transition from various electronic levels to a lower energy level of n=3.

To compute the wave number that is the inverse of wavelength we use the FORMULA

1/λ=RZ^2([1/n1^2]-[1/n2^2])

here n1=3 and n2=4 as the transition between two successive ORBITS involves low energy difference thereby huge wavelength from the formula

E=hc/λ

thereby computing

1/λ=R×9[{1/9}-(1/16)]

1/λ=R×7/16

⇒λ=16/7R

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