You blow across the open mouth of a test tube and produce the fundamental standing wave of the air column inside the test tube if the length of the air column in the test tube is 14 cm, what is the frequency of the fundamental standing wave in the air column if the test tube is half filled with water? the speed of the sound in air is 344 m/s.
A: 1000 Hz
B: 980 Hz
C: 460 Hz
D: 1230 Hz
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