Ultrasound's medical imaging applications

Steps:

• Ultrasound involves high-frequency sound waves beyond human hearing.
• In jewellery cleaning, these waves create cavitation bubbles to remove dirt.
• Another key application is medical diagnostics, where waves reflect off tissues to form images.
• Prenatal scanning uses this reflection to visualize fetuses safely without radiation.

Why B is correct:

• Ultrasound imaging relies on the piezoelectric effect, where transducers emit and receive waves to produce real-time echoes of internal structures like a developing baby.

Why the others are wrong:

• A: Optical fibre communications transmit data via light pulses, not sound waves.
• C: Photography captures images using visible light and lenses, unrelated to sound.
• D: Telephone communications use electrical signals and audible sound for voice, not high-frequency ultrasound.

Final answer: B