Question

a cashier who has been handed a hundred-dollar bill may check its authenticity by holding it under a special lamp that emits electromagnetic radiation mostly at wavelengths slightly shorter than visible light. the electromagnetic radiation makes a pattern of previously invisible markings on the bill glow brightly, or fluoresce. which kind of electromagnetic radiation does the lamp emit to produce this effect?
options:
○ x-rays
○ microwaves
○ infrared radiation
○ ultraviolet radiation

Explanation:

Answer:

Ultraviolet radiation (since ultraviolet radiation has wavelengths slightly shorter than visible light and is used for fluorescent effects like authenticating currency markings; among the options, ultraviolet radiation is the correct choice as X - rays have much shorter wavelengths, microwaves and infrared have longer wavelengths than visible light in general, and ultraviolet fits the "slightly shorter than visible light" description for causing fluorescence in currency markings). The option is: Ultraviolet radiation (the last option in the list).