Assertion: whistle | /r/CapableOf | sound its natural frequency
Facets:
Source sentences:
text: When a whistle is sounding its natural frequency, the effective length referred to here is somewhat longer than the physical length above the mouth if the whistle is of uniform cross-sectional area.
text: When a whistle is sounding its natural frequency, the length referred to here is somewhat longer than the physical length above the mouth if the whistle is of uniform cross-sectional area.