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October 7th, 2017, 10:44 AM   #1
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Exclamation help please

what is a type of a electromagnetic wave that is used to kill bacteria on food?
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October 7th, 2017, 10:45 AM   #2
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I'll give you a hint.

What type of electromagnetic wave/radiation gives you a tan? (or skin cancer)

same type is used to sterilize food.
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