A tetrameter is not a unit of length - it is a unit of rhythm. Perhaps you are mistaking this for a terameter, which indeed is a unit of length, equal to 1,000,000,000 metres.
6.5E23
One nanometer is equivalent to .000000001 meters (1 x 10^-9 m). Therefore 650 nanometers equals .00000065 meters or 6.5 x 10^-7 meters.
1mm is 1,000,000 nanometers.
25000000 nanometers
"nanometer" or billionths of a meter. 650 nanometers is the wavelength of the light produced by the diode.
150 nanometers is 0.00000015m
1 Angstrom = 0.1 nanometers
1 millimeter=1,000,000 nanometers
2 millimeters=2,000,000 nanometers
1 nanometer = 0.000001 millimeter6 nanometers = 0.000006 millimeter60 nanometers = 0.00006 millimeter600 nanometers = 0.0006 millimeter621 nanometers = 0.000621 millimeter
1.000 micrometers = 1,000 nanometers 0.600 micrometer = 600 nanometers
500 nanometers = 0.0005 millimeters.