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Unformatted text preview: H atoms at the current time ( z = 0); (b) Calculate the density of H atoms at z =10; (c) Assume that a photon of = 21 cm was emitted when the universe was 10 times smaller (in diameter) than it is now. Calculate the wavelength of the photon detected at Earth now. (d) Assume that the Hubble constant is H = 70 km s1 Mpc1 . Calculate the Hubble parameter H ( z ) when z = 10. 4. Problem 29.10 from the textbook...
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 Fall '09
 BONAMENTE

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