The interval (in seconds) between the on and off state of a normal microwave at 50% power can vary depending on the specific model and make of the microwave. However, in most conventional microwaves, the power level is adjusted through a process called "pulse width modulation" (PWM), which means the microwave turns on and off in cycles to achieve the desired power level.
At 50% power, the microwave will be on for 50% of the cycle time and off for the other 50%. The frequency of the on-off cycles is typically in the order of several hundred to a few thousand Hertz.
To calculate the interval between the on and off states (i.e., the duration of one cycle), you can use the following formula:
Interval = 1 / Frequency
For example, if the microwave operates at a frequency of 500 Hz, the interval would be:
Interval = 1 / 500 = 0.002 seconds (2 milliseconds)
Keep in mind that microwave technology may evolve, and some newer models might have different methods of power control, but this is the general principle for conventional microwaves