If the wavelength of line B is 142.5 nm, calculate the wavelength of line A.

Line A is the transition of n=6 to n=3
Line B is the transition of n=5 to n=3

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1. lambdaA/lambdaB=(1/36-1/9)/(1/25-1/9)

check my thinking.

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2. i don't get it

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posted by Robin

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