Fig 1.1 shows some of the energy levels of the hydrogen atom.
Calculate the energy of radiation emitted when an electron falls from level n = 3 to the ground state in the hydrogen atom.
When electrons in a sample of hydrogen atoms relax from n = 3, multiple frequencies of photons are emitted.
Sketch arrows on Fig 1.1 to show the transitions responsible for these photons.
Calculate the wavelength of the photon with the smallest energy. Give your answer to an appropriate number of significant figures.
One way to excite a hydrogen atom is by the absorption of a photon.
Explain why, for a particular transition, the photon must have an exact amount of energy.
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