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4. An excited hydrogen atom emits a photon when an electron drops from the n = 5 energy level down to the n = 2 energy level. Answer the following:

d. State the energy of the n = 2 and n = 5 energy levels for hydrogen (you can look them up or calculate them), [1 mark) e. Calculate the frequency of the emitted photon. [2 marks]

Fig: 1

Fig: 2

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