Assertion: light's frequency | /r/HasProperty | 0.5 hertz
Facets:
Source sentences:
text: cycling, periodically—from lowest frequency (0.5 hertz) to highest frequency (2.0 hertz), top to bottom.
text: T and f are These three dots are flashing, or, periodically—from lowest frequency (0.5 hertz) to highest frequency (2.0 hertz), top to bottom.