Multiple choice

Which of the following statements is/are correct?

  1. UV rays don’t produce heating effect while infrared rays produce heating effect.
  2. Infrared rays are used for detecting forged bank notes.

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement (1) is correct. Infrared rays lie just under the visible light range in the electromagnetic spectrum. The molecules of IR rays are strike to oscillate, which produce heating effect. Statement (2) is wrong. For detecting forged bank notes, UV rays are used. Some bank notes have security elements either words or images printed onto the note using non-visible dyes, which fluorescence under ultraviolet light.

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