Ultrasound's cleaning application via cavitation

Steps:

• Ultrasound refers to sound waves with frequencies above 20 kHz, inaudible to humans.
• These waves produce cavitation bubbles in liquids that implode to dislodge dirt.
• Evaluate options: A matches cleaning processes; others involve different wave types.
• Select A as the direct use of ultrasound's mechanical effects.

Why A is correct:

• Ultrasound cleaning relies on cavitation, where high-frequency waves generate microscopic bubbles in liquid that collapse, creating shock waves to remove contaminants from jewelry surfaces.

Why the others are wrong:

• B: Satellite communication uses electromagnetic radio waves, not sound.
• C: Fluorescent tubes operate via electrical discharge exciting mercury vapor to produce UV light.
• D: Optical fibers transmit data using light waves through total internal reflection.

Final answer: A