... Oneatomic mass unit (1 u) is defined as one-twelfth themass of an atom of carbon-12. Since the experimen-tally measured mass of an atom of carbon-12 is1.9926 ϫ 10Ϫ23g, 1 u ϭ 1.6606 ϫ 10Ϫ24g. ... light detection is theabsorption of visible light by 11-cis-retinal. The energy of the absorbedlight (about 250 kJ/mol) converts 11-cis-retinal to all-trans-retinal,triggering electrical changes ... energy of po-sition as it approaches the ground. When an appropri-ate string-and-pulley device couples the falling object toanother, smaller object, the spontaneous downward mo-tion of the...