Assertion: flute's tone hole | /r/HasProperty | open
Facets:
Source sentences:
text: Below about 2.5 kHz, this curve looks like that for a simple cylindrical pipe with about half the length of the flute, because the tone holes are open in the bottom half of the instrument.
text: A tone hole is an opening in the body of a wind instrument which, when alternately closed and opened, changes the pitch of the sound produced.