21. A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:

The radar's average power is calculated by multiplying the peak power by the duty cycle, which is the pulse width divided by the pulse repetition interval. With a 0.5 microsecond pulse every 1600 microseconds, the duty cycle is 0.0003125, resulting in an average power of 31.25 watts.