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

General Science (NDA) Physics

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

Ultraviolet waves

Infrared waves

Radio waves

Microwaves

Explanation:

Ultraviolet waves or UV rays are used for detecting fake and forged currency.
The paper currency has a strip that is embedded in the note. This strip cannot be forged like that in the original currency.
An authentic paper currency will fluoresce when it is illuminated by long wave ultraviolet light.