Not just that they have peaks and valleys, some things are simply not heated by microwaves. The ice crystals in frozen food are only heated by-proxy because the tiny amounts of already melted off water will heat up and melt more ice, so there is no benefit in blasting an ice cube at full power for 40 minutes.
Yes a wave has peaks and valleys
Rotating reduces this short coming
And waiting allows the heat to spread
Not just that they have peaks and valleys, some things are simply not heated by microwaves. The ice crystals in frozen food are only heated by-proxy because the tiny amounts of already melted off water will heat up and melt more ice, so there is no benefit in blasting an ice cube at full power for 40 minutes.