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The power output of a 697-kHz AM radio station is 50.0 kW. If the radio waves are broadcast uniformly in all directions, find the number

The power output of a 697-kHz AM radio station is 50.0 kW. If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 22 km in units of 1020. Assume no reflection from the ground or absorption by the air.

Enter a integer. The number of photons per second per square meter is this integer * 1020.

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