Question: An 0 5 type star releases 5 . 1 x 1 0 ^ 4 9 high energy photons per second. If the density of hydrogen

An 05 type star releases 5.1x10^49 high energy photons per second. If the density of hydrogen in the interstellar medium surrounding the star is 1500cm^-3, make an estimate of the radius of the stromgren sphere around the star in parsecs. Assume a(alpha)=3x10^13cm^3s^-1 for the interstellar medium.

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