Assertion: sound wave's wavelength | /r/HasProperty | measured with trough
Facets:
value: on bottom
type: LOCATION
value: between any two points
type: LOCATION
Source sentences:
text: The wavelength of a sine wave , λ, can be measured between any two points with the same phase , such as between crests (on top), or troughs (on bottom), or corresponding zero crossings as shown.