The crystals reflect
light at a certain wavelength depending on their spacing, so the relaxed gel appears green, but squeezing or stretching it turns it blue or red.
«Among such structures, one of the more interesting is similar to structures found in nature, and is referred to as a «moth - eye» pattern: tiny nanopillars which can «beat» the Fresnel
equations at certain wavelengths and angles.»
As you can see in the graph, there are several peaks in the CCO absorption of
photons at certain wavelengths.6 The highest of these peaks are at about 660 - 670 nm and 830 - 850 nm.
Greenhouse gases absorb some of the infrared energy that Earth emits in so - called bands of stronger absorption that
occur at certain wavelengths.
Methane and other pollutants, like benzene and toluene, that are released from oil and gas operations absorb infrared radiation
at certain wavelengths on the electromagnetic spectrum.
«Light
at certain wavelengths can be absorbed out of a thin optical waveguide by a microresonator — which is essentially a tiny glass sphere — when they are brought very close,» explained Gaurav Bahl, an assistant professor of mechanical science and engineering at Illinois.
Light would pile up on top of the holes, and
at certain wavelengths, the holes transmitted more of that light than actually reached the hole.
As starlight passes through a planet's atmosphere, atoms and molecules absorb light
at certain wavelengths, blocking it from the telescope's view.
For instance, surgical lasers emit beams of light
at a certain wavelength that allows them to cut tissue and cauterize bleeding vessels.