Question:easy
The Doppler effect results from a change in which property of sound?
The Doppler effect results from a change in which property of sound?
Show Hint
Moving targets shift the echo pitch - it is a frequency change.
Updated On: Jun 24, 2026
- Amplitude of sound
- Frequency of sound
- Direction of sound
- None of the above
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Picture a sound wave bouncing off a moving column of blood. The motion compresses or stretches the wave, altering how many cycles arrive at the probe each second, which is precisely the frequency.
Step 2: The probe transmits at a known frequency and listens for the echo. Comparing the transmitted and received frequencies gives the Doppler shift, the foundation of Doppler ultrasound.
Step 3: Flow toward the probe raises the echo frequency, flow away from it lowers the frequency. This shift is converted into a velocity reading, letting clinicians measure blood flow.
Step 4: Amplitude relates to loudness and direction to the path of travel, neither of which defines the Doppler phenomenon. The defining change is in frequency.
\[\boxed{\text{Frequency of sound}}\]
Step 2: The probe transmits at a known frequency and listens for the echo. Comparing the transmitted and received frequencies gives the Doppler shift, the foundation of Doppler ultrasound.
Step 3: Flow toward the probe raises the echo frequency, flow away from it lowers the frequency. This shift is converted into a velocity reading, letting clinicians measure blood flow.
Step 4: Amplitude relates to loudness and direction to the path of travel, neither of which defines the Doppler phenomenon. The defining change is in frequency.
\[\boxed{\text{Frequency of sound}}\]
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