Light interacts with matter through absorption, transmission and reflection. When light strikes the leaf of a plant, the leaf absorbs the light energy, and through the process of photosynthesis, transforms the energy into the food glucose. The leaf reflects the green wavelengths of visible light, giving it the green color.Know More
When light passes into a suspension, it is possible for people to see reflection and transmission. Windows transmit light, brightening a room. However, if light rays strike dust particles in the air, the rays are reflected to the eyes.
The color of an item is due to the wavelengths of light it absorbs and those it reflects. Objects that do not absorb any wavelengths of light appear white. Those that absorb all wavelengths appear black. However, other colors require a combination of absorption and reflection. A red cup appears red because it absorbs all the wavelengths of the spectra other than red while reflecting red to the observer's eyes. Thus, color is only intrinsic to an item because it has a few atoms on the surface that absorb some of the light. The scientific name of these color-absorbing atoms is pigments. Any remnants of white light the pigments do not absorb reflect to the eyes.Learn more about Optics & Waves
Sound does not travel through a vacuum because molecules of matter are required for sound to exist, and vacuums do not have any matter. The vibrations and movements of small particles of matter are what create sound and allow it to be heard. In a vacuum without any matter, such as space, it is impossible for sound to travel.Full Answer >
A tritium light is a green, glowing light source that has been chemically created with radioactive hydrogen and phosphor. The tritium light is created by sealing tritium gas inside laser-sealed glass tubes coated with phosphor.Full Answer >
A particle of light is called a photon, which is a small particle made up of electromagnetic radiation. These particles have no charge or resting mass, but travel at the speed of light. The energy of photons cannot be divided, thus they are often referred to as energy packets.Full Answer >
When light travels in a vacuum, its speed is 186,282 miles per second. The fastest aircraft, which is the Boeing-43 scramjet, has a speed of 7,546 miles per hour. If these two speeds are compared, the jet's speed is approximately 0.0004 percent that of light.Full Answer >