Submitted by mynameizjared on Wed, 2009-03-11 22:01

Calculate the wavelength of a photon emitted by a hydrogen atom when the electron undergoes a transition from level n=5 to level n=1.

Can someone please show me how to start this.

I'll reply back with my work , and you can check if it's right.

PLEASE AND THANKS.

kingchemist

Thu, 2009-03-12 14:03

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## Re: Wavelength of a Photon

I;m not an expert on this (or many other areas) but you will need to use the Rydberg equation which you can find on the internt. It is

(1/wavelength) = R

_{H}((1/n1^2))-(1/n5^2)Better to look this up to make sure the division and powers are as meant.

where R

_{H}is the Rydberg constant for hydrogen, n1 is the 1st energy level, n5 is the fifth energy level).Once you have the wavelength you can calculate the energy of the photon (

E = hc/wavelength where h = Planck's constant.