A Doppler shift occurs when the received frequency is lower than the transmitted frequency. This shift is described as:

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Multiple Choice

A Doppler shift occurs when the received frequency is lower than the transmitted frequency. This shift is described as:

Explanation:
Sign of the Doppler shift is about whether the observed frequency is higher or lower than the emitted one. The Doppler shift is defined as the received frequency minus the transmitted frequency (f_r − f_t). If the received frequency is lower, this difference is negative. So the shift is described as negative. In ultrasound practice, a negative shift means motion away from the transducer, while a positive shift means motion toward the transducer. The magnitude of the shift is the absolute value of that difference, but the sign communicates direction.

Sign of the Doppler shift is about whether the observed frequency is higher or lower than the emitted one. The Doppler shift is defined as the received frequency minus the transmitted frequency (f_r − f_t). If the received frequency is lower, this difference is negative. So the shift is described as negative. In ultrasound practice, a negative shift means motion away from the transducer, while a positive shift means motion toward the transducer. The magnitude of the shift is the absolute value of that difference, but the sign communicates direction.

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