A doppler current meter shows an increase in sound frequency if the water flow is
A) moving away from the meter.
B) moving toward the meter.
C) moving around the meter.
D) increasing.
E) decreasing.

Question

Quizplus · Accepted Answer

A doppler current meter works based on the principle of the doppler effect, which states that the frequency of sound waves will change if there is relative motion between the source and the observer. In the case of a doppler current meter, the source is the emitted sound waves and the observer is the instrument itself. If the water flow is moving toward the meter, the sound waves emitted by the instrument will be compressed, causing an increase in frequency, which can be detected by the instrument. Therefore, the correct choice is B.

A Doppler Current Meter Shows an Increase in Sound Frequency