When the sun is directly overhead the optical depth equals one (τ=1) at an altitude of 6 km.  The neutral gas density at this altitude is 7×1011 particles/cm3.  The ionization cross-section and photon flux at the top of the atmosphere have average values of σi = 3×10-19 cm2 and Itop= 5×109 photons cm-2 s-1, respectively. Calculate the photo-ionization rate at an altitude of 6 km for these conditions.  Report answer in scientific notation to 2 significant digits. The photo-ionization rate is  _____ cm-3 s-1

Applications and Investigations in Earth Science (9th Edition)
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Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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When the sun is directly overhead the optical depth equals one (τ=1) at an altitude of 6 km.  The neutral gas density at this altitude is 7×1011 particles/cm3.  The ionization cross-section and photon flux at the top of the atmosphere have average values of σi = 3×10-19 cm2 and Itop= 5×109 photons cm-2 s-1, respectively.

Calculate the photo-ionization rate at an altitude of 6 km for these conditions.  Report answer in scientific notation to 2 significant digits.

The photo-ionization rate is  _____ cm-3 s-1

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