Assertion: light | /r/HasAspect | a wavelength of 555 nanometres
Facets:
Source sentences:
text: The sensitivity of the human eye is greatest for light having a wavelength of 555 nanometres (10-9 metre); at this wavelength there are 685 lumens per watt of radiant power, or radiant flux (the luminous efficiency), whereas at other wavelengths the luminous efficiency is less.