Answer: The most common unit is the watt (W), defined as 1 joule (J) of energy per second.
I do not know if this answer this question but I try my best
Mainly this go under the science tab. Just to let you be aware.
Anyways, you change radiant energy into thermal energy. Since the rays warm up the food, which transfer the energy to it, causing it to heat up.
Hope this helps!
~GeeksandNerds
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The state of being cultivated