Question

Which one of the following does NOT use piezoelectric transducers?

• A. Ultrasonography
• B. Phonocardiography
• C. Echocardiography
• D. Electroencephalography

Hint:

Piezoelectric transducers are primarily used in devices that involve sound wave generation or detection, such as ultrasonography, phonocardiography, and echocardiography.

Answer 1

The Correct Option is D

Piezoelectric transducers are devices that convert mechanical energy into electrical energy using the piezoelectric effect. These transducers are commonly used in medical imaging and diagnostic equipment that rely on sound waves.
Step 1: Identifying devices that use piezoelectric transducers.
Ultrasonography, phonocardiography, and echocardiography all use piezoelectric transducers to generate and detect sound waves.
Ultrasonography uses sound waves for imaging internal structures.
Phonocardiography records heart sounds using piezoelectric sensors.
Echocardiography uses sound waves to create images of the heart and assess its function.
Step 2: Electroencephalography (EEG).
EEG, however, measures electrical activity in the brain using electrodes placed on the scalp. It does not rely on piezoelectric transducers but instead detects electrical signals directly from the brain.
Step 3: Conclusion.
The correct answer is (D), as electroencephalography does not use piezoelectric transducers.