Edexcel A-Level Physics AS 2.3.63 Atomic Line Spectra and Energy Levels Questions

Practise Edexcel IAL Physics 2.3.63 by linking line spectra to fixed energy levels, calculating wavelength from eV differences and E=hf and testing allowed energies in diagrams.

Exam points

explain line spectra from electron transitions between fixed atomic energy levels
calculate emitted or absorbed photon wavelength from eV energy differences and E = hf
decide which photon energies or line frequencies are possible from energy-level diagrams

[Maximum number: 6]

The diagram shows the energy levels for an atom of hydrogen.

Figure for Question Edexcel A-Level Physics AS 2.3.63 Atomic Line Spectra and Energy Levels Questions question 1 — Edexcel A-Level Physics AS

(a)

A photon has a wavelength of $218\,\mathrm{nm}$ .

[ 6 ]

(i)

Determine the energy, in $\mathrm{eV}$ , of this photon.

[ 4 ]

Using $c=f\lambda$ , $f=3.00\times10^8/(218\times10^{-9})=1.38\times10^{15}\,\mathrm{Hz}$ . Thus $E=hf=(6.63\times10^{-34})(1.38\times10^{15})=9.12\times10^{-19}\,\mathrm{J}=5.70\,\mathrm{eV}.$

(ii)

Explain whether the atom of hydrogen could emit a photon with this energy.
(2)

[ 2 ]

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Edexcel A-Level Physics AS 2.3.63 Atomic Line Spectra and Energy Levels Questions question 1

Question (a)

Question (i)

Question (ii)