1.

3) 7 x 1020 Photons/sec 4) 9 x IU PlO2. The number of photons emitted per second by aMedium wave transmitter of 10 kW power, emituntaheradio waves of wavelength 500m2.51 x 10312) 1.51 x 10312951 x 1031e 20%3) 7.51 x 1031

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