Which term refers to the system's original transmitted frequency?

Which term refers to the system's original transmitted frequency?

• A. Fundamental frequency
• B. Amplitude
• C. Density
• D. Fractional bandwidth

Answer: (A)

The fundamental frequency is the system’s base transmitted frequency—the frequency the transducer initially emits. It serves as the reference point for all subsequent frequencies generated as the wave travels through tissue. Nonlinear propagation in tissue can create harmonics, which are multiples of this base frequency, but those higher frequencies arise after transmission and are not the original transmitted frequency. Amplitude describes how strong the wave is, not its frequency. Density relates to the medium’s properties that affect speed and attenuation, not the base frequency. Fractional bandwidth describes how wide the frequency content is around the center frequency, not the actual transmitted frequency. So the term that refers to the system’s original transmitted frequency is fundamental frequency.

The fundamental frequency is the system’s base transmitted frequency—the frequency the transducer initially emits. It serves as the reference point for all subsequent frequencies generated as the wave travels through tissue. Nonlinear propagation in tissue can create harmonics, which are multiples of this base frequency, but those higher frequencies arise after transmission and are not the original transmitted frequency. Amplitude describes how strong the wave is, not its frequency. Density relates to the medium’s properties that affect speed and attenuation, not the base frequency. Fractional bandwidth describes how wide the frequency content is around the center frequency, not the actual transmitted frequency. So the term that refers to the system’s original transmitted frequency is fundamental frequency.