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23 January, 16:54

What type of electromagnetic wave is used in security pens?

a. X-rays

b. Visible light

c. Microwaves

d. Ultraviolet radiation

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Answers (2)
  1. 23 January, 19:29
    0
    The correct awnser is D
  2. 23 January, 20:50
    0
    D. ultraviolet radiation
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