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Classical Cepheid variables exhibit luminosity-period relation that is approximately governed by the following equation: L = 1.7 1034 erg s1(P/day)0.97 You observe a classical Cepheid

Classical Cepheid variables exhibit luminosity-period relation that is approximately governed by the following equation: L = 1.7 1034 erg s1(P/day)0.97 You observe a classical Cepheid variable in a nearby galaxy and measure an average flux of 1.28 1016 erg s1 cm2. It has a period of 40 days. What is the distance to this nearby galaxy in units of Mpc

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