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Assuming a baryon-to-photon ratio 7 = 6.1 x 10-10, at what temperature T will there be one ionising photon, with hf > Q =

Assuming a baryon-to-photon ratio 7 = 6.1 x 10-10, at what temperature T will there be one ionising photon, with hf > Q = 13.6 eV, per baryon? [Hint, the result of Ryden's Exercise 2.5 will be useful.] Is the temperature you calculate greater or less than Trec = 3760 K?

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