Question

Question was provided via image upload.

Explanation:

Identify the question

The question asks which electromagnetic wave is used to detect security ink on bank notes.

Analyze the options

• X-rays: High energy, used for medical imaging and security scans of luggage.
• Visible light: Standard illumination, does not excite fluorescent security inks.
• Infrared: Used in remote controls and thermal imaging.
• Ultraviolet: Excites fluorescent substances in security ink, causing them to glow.

Determine the correct wave

Ultraviolet radiation is standardly used to verify security features on banknotes.

Answer:

• X-rays
• Visible light
• Infrared
• Ultraviolet (Correct answer)