Calculating the visible emission spectrum for hydrogen

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ciaranciaran1

so the title speaks for itself i hope. my problem is i don't know how to work the formula. what are the ns about??

lamba^-1 = R(n1^-2 - n2^-2)

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ciaranciaran1

I should of said, r, the rydberg constant, is given.

Borek

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