# Calculate the energy and wavelength of the photon.

An atom has an energy level 1.8 eV above ground state. When excited, it returns to the ground state and emits a photn. Ccalculate the energy and wavelength of the photon.

thank you

arcnets
Well if you ask like this, I think it's like in Homework Help: You would learn nothing from a direct answer.
So here's a hint: How, do you think, has it been found out that the energy level is actually 1.8 eV?

Planck said that the energy of a photon is directly related to the frequency of the photon. We can express that as E = hf where h means Planck's constant.

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einsteinian77
ShawnD, Einstein said that

No, Planck said it. That's why they call it "Planck's constant"

Kalimaa23
Nope, it was Einstein who came up with the whole "photon" thing in his paper on the photo-eletric effect, which got him the Nobel Price.

For many years, Planck simply didn't buy the idea

frankR
Originally posted by Dimitri Terryn
Nope, it was Einstein who came up with the whole "photon" thing in his paper on the photo-eletric effect, which got him the Nobel Price.

Ding, ding, ding! That's what Einstein won the Noble Prize for.