Say a microwave oven magnetron operates at 2000V between the cathode and anode. Say the magnetron has an efficiency of 75%. Say the microwave photons have a energy of about 10E-5eV. We are told that most of the energy loss is in the magnetron. Can we then say that each electron on average on its way from the cathode to the anode emits about .75x2000/10E-5 = 1.5E8 microwave photons? Is there a way to come up with a rough number for the number of orbits a typical electron makes in the magnetron on its way from cathode to anode. Thanks!