Chemistry Question?

Posted on 2015-11-13 05:58:00 in Chemistry by PAUL LEE

Can somebody tell me where I went wrong?

1) What is the longest wavelength of light that can be emitted by a hydrogen atom, if the electron is initially in the n=7 level? Give your answer accurate to three significant figures.

I used the equation
1/lanta= -Rh (1/n2^2 -1/n1^2)

What I did:
lanta=[ -2.179x10^-18 (1/36-1/49)]^-1
lanta=-3.55x10^19

2) If the electron in a hydrogen atom undergoes a transition from an n = 6 level to an n = 4 level, what is the wavelength of the radiation emitted? Give your answer accurate to three significant figures.

I did the same process to this as well but got -1.32x10^19 which is incorrect as well.

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