1. i) Show that the energy of a photon of wavelength 486 nm is 4.09 × 10^–19 J.

[1]

ii) Fig. 5.4 shows some of the energy levels of an electron in a hydrogen atom.

Fig. 5.4 (not to scale)

Draw an arrow on Fig. 5.4 to show an electron transition which would cause the emission of a photon of wavelength 486 nm.

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