A disk in the shape of a CD-ROM is coated with a radioactive lm that emits a billion photons per…

A disk in the shape of a CD-ROM is coated with a radioactive
lm that emits a billion photons per second. If the radius of the disk is
10 cm, what is the photon ux at a distance of 10 m from the center of the
disk and parallel to its symmetry axis?

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