A gamma-ray telescope intercepts a pulse of gamma radiation, Ask an Expert

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A gamma-ray telescope intercepts a pulse of gamma radiation from the magnetar, a sort of star having a spectacularly big magnetic field. The pulse lasts 0.30 s and delivers 8.8 x 10^-6 J of energy perpendicularly to the 56-m² surface area of the detector of telescope. The magnetar is thought to be 5.74 x 10²⁰m (around 61000 light-years) from earth, and to encompass a radius of 8.8 x 10³ m. Determine the magnitude of the rms magnetic field of the gamma-ray pulse at the surface of magnetar, supposing that the pulse radiates uniformly outward in all the directions. (Suppose a year is 365.25 days.)

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