# Calculating the visible emission spectrum for hydrogen

1. ### ciaranciaran1

2
so the title speaks for itself i hope. my problem is i dont know how to work the formula. what are the ns about??

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

2. ### ciaranciaran1

2
I should of said, r, the rydberg constant, is given.