AQA AS Physics Unit 1 January 2009 Question 1

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Welcome to the first AQA AS Physics January 2009 paper, in question 1 we look at the excitation of atoms and specific charge.

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I dont understand. If it is asking for the wavelength photon with the smallest energy level why did they use n=3 minus n=2 instead of n=4 minus n=3 because that energy level difference is smaller

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