The impedance of PZT is about 20 times greater than skin; this mismatch primarily affects energy transfer by causing what?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

The impedance of PZT is about 20 times greater than skin; this mismatch primarily affects energy transfer by causing what?

Explanation:
Impedance mismatch controls how much energy crosses the boundary between two media. When a wave moves from a high-impedance material like PZT into a much lower-impedance material like skin, most of the energy is reflected back at the interface, and only a small portion is transmitted into the tissue. The large 20x difference means a substantial amount of energy never gets into the skin, greatly reducing transmission. The pulse duration isn’t directly shortened by this mismatch; the dominant effect is less energy reaching the tissue due to reflection at the boundary.

Impedance mismatch controls how much energy crosses the boundary between two media. When a wave moves from a high-impedance material like PZT into a much lower-impedance material like skin, most of the energy is reflected back at the interface, and only a small portion is transmitted into the tissue. The large 20x difference means a substantial amount of energy never gets into the skin, greatly reducing transmission. The pulse duration isn’t directly shortened by this mismatch; the dominant effect is less energy reaching the tissue due to reflection at the boundary.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy