Determine the photon flux, Physics

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Suppose that the x rays are emitted from a focal spot isotropically. The photon flux is 3.28 x 10⁶ photons mm^-2 sec^-1 at a distance of 0.75 m from the focal spot. What is the photon flux at a distance of 10 cm from the focal spot? Neglect the effects of air attenuation.

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