The wavelength, which in 1931 was difficult to reproduce as a monochromatic beam, was chosen because the eye's perception of color is rather unchanging at this wavelength, and therefore small errors in wavelength of this primary would have little effect on the results.
12.
A monochromatic beam ( one for which all the particles have the same impulse ) encounters a first screen, diffracts, and the diffracted wave encounters a second screen with two slits, resulting in the formation of an interference figure on the background " F ".
13.
These cells converted 850 nm light to electrical power with an efficiency of 53 %-the highest efficiency reported at the time produced for a cell irradiated with a monochromatic beam . [ ] For this research, Dr . Olsen was named WSU Distinguished Professor in Material Science in 1992 . [ ].
