If the Propagation Speed of the Transducer Element Is 4

question 14

Multiple Choice

If the propagation speed of the transducer element is 4 mm/µs,the thickness required for an operating frequency of 10 MHz is ________.

• A) 0.4 mm
• B) 0.8 mm
• C) 0.2 mm
• D) 0.1 mm

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Definitions:

Physiological Needs

Physiological needs are the basic requirements for human survival, such as air, food, water, shelter, clothing, and warmth, which must be met before individuals can focus on higher-level needs.

Esteem Needs

Psychological requirements for respect, self-esteem, and recognition, as part of Maslow's hierarchy of needs.

Affiliation Needs

The human desire to belong to a group, be accepted, and maintain relationships with others, driving social interactions.

Security Needs

Basic human requirements for safety and stability, including physical safety, employment, resources, health, and property, as essential for well-being.