A Doppler ultrasound system operates with a pulse repetition frequency of 12 kHz. Which numeric frequency does this correspond to?

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Multiple Choice

A Doppler ultrasound system operates with a pulse repetition frequency of 12 kHz. Which numeric frequency does this correspond to?

Explanation:
Converting frequency units is the key. 1 kilohertz equals 1,000 hertz, so 12 kilohertz is 12 × 1,000 = 12,000 hertz. That makes the numeric frequency 12,000 Hz. The other numbers don’t fit: 0.12 Hz is far too small, 1,200 Hz is 1.2 kHz, and 120 MHz is 120,000,000 Hz—much higher than 12 kHz.

Converting frequency units is the key. 1 kilohertz equals 1,000 hertz, so 12 kilohertz is 12 × 1,000 = 12,000 hertz. That makes the numeric frequency 12,000 Hz. The other numbers don’t fit: 0.12 Hz is far too small, 1,200 Hz is 1.2 kHz, and 120 MHz is 120,000,000 Hz—much higher than 12 kHz.

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