Final answer:
The longest pulse repetition period would be for the lowest pulse repetition frequency, which is 6 Hz. Therefore, option C (6 Hz) would have the longest pulse repetition period.
Step-by-step explanation:
The pulse repetition frequency (PRF) is the number of pulses transmitted per second in applications such as ultrasound imaging. The pulse repetition period (PRP) is the inverse of the PRF, which means that as the PRF increases, the PRP decreases. Given the values of pulse repetition frequencies:
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- A. 2 kHz
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- B. 4,000 Hz
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- C. 6 Hz
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- D. 1 kHz
We can determine that the longest pulse repetition period would be associated with the lowest pulse repetition frequency. Among the given options, 6 Hz is the lowest frequency. Therefore, option C (6 Hz) would have the longest pulse repetition period.