Which one of the following waves is used for detecting forgery in currency notes?

Ultraviolet waves

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Infrared waves

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Radio waves

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Microwaves

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Solution

The correct option is A Ultraviolet waves
Ultraviolet waves are used for detecting forgery in currency notes. The paper currency has a strip that is embedded in the note. This strip can be cannot be forged.
An authentic paper currency will fluoresce when it is illuminated by long wave ultraviolet light. The embedded stripe will fluoresce in accordance with a color chart.

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