Ultraviolet radiation's sterilization property

Steps:

• Recall that ultraviolet (UV) radiation has wavelengths shorter than visible light, making it effective for disinfection.
• Identify applications: UV kills microorganisms by damaging their DNA without heat.
• Evaluate choices: Match each to electromagnetic spectrum types.
• Select the one using UV for practical purposes like purification.

Why C is correct:

• UV radiation sterilizes water by emitting photons that break DNA bonds in bacteria and viruses, preventing reproduction (based on photochemical absorption laws).

Why the others are wrong:

• A: Bluetooth uses radio waves for wireless communication.
• B: Prenatal scanning employs ultrasound waves for imaging.
• D: Thermal imaging detects infrared radiation for heat signatures.

Final answer: C