Approximately how wide is each strip section of the piezoelectric element?

Approximately how wide is each strip section of the piezoelectric element?

• A. The width of a pencil lead
• B. A half of that of a piece of hair
• C. The width of a grain of rice
• D. The width of a fingerprint

Answer: (B)

The size of each piezoelectric strip is kept extremely thin so you can pack many elements across the transducer face, which allows precise beam control and focusing. A hair is already very thin, and using a width about half of that provides enough elements to form a dense array without making each strip too fragile or hard to connect. In other words, the strips are about tens of micrometers wide, which is roughly half the width of a typical hair. The other options describe thicker objects (pencil lead, grain of rice, fingerprint), which would not give the high-density array needed for good image resolution.

The size of each piezoelectric strip is kept extremely thin so you can pack many elements across the transducer face, which allows precise beam control and focusing. A hair is already very thin, and using a width about half of that provides enough elements to form a dense array without making each strip too fragile or hard to connect. In other words, the strips are about tens of micrometers wide, which is roughly half the width of a typical hair. The other options describe thicker objects (pencil lead, grain of rice, fingerprint), which would not give the high-density array needed for good image resolution.