Matching electromagnetic spectrum applications

Steps:

• Recall X-rays ionize atoms for medical treatments like killing cancer cells.
• Note ultraviolet light's germicidal properties sterilize surfaces and instruments.
• Identify microwaves' role in long-distance signal transmission for satellite TV.
• Match option B to these: X-rays for cancer, UV for sterilization, microwaves for satellites.

Why B is correct:

• X-rays penetrate tissues to destroy cancer DNA via ionization; UV disrupts microbial DNA for sterilization; microwaves carry TV signals through atmospheric propagation.

Why the others are wrong:

• A mismatches: microwaves for phones, UV for fluorescents, but alarms use infrared.
• C mismatches: X-rays for imaging, infrared for remotes, UV for sunbeds.
• D mismatches: UV for sterilization, infrared for controllers, X-rays for crack detection.

Final answer: B