THIS USER ASKED 👇
What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation
THIS IS THE BEST ANSWER 👇
What type of electromagnetic wave is used in security pens?
D. Ultraviolet radiation
because the wavelength is shorter than the violet wave of the visible spectrum but longer than x-rays
I hope this helped;)
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