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Aug 27, 2024 · What is Light Energy? Light energy is a form of electromagnetic radiation visible to the human eye. It travels in waves and can come from natural sources like the sun or artificial sources like light bulbs. This energy is essential for processes like photosynthesis and vision. Light Energy Formula E = ℎ𝑓
- Waves of Light
- Colours of Light
- To Summarise
These different colours of light have different wavelengths and frequencies. Red light has the longest wavelength, and the lowest frequency of the visible spectrum. Violet has the shortest wavelength, and the highest frequency of the visible spectrum.
Mixing coloured materials, such as paint, is an example of subtractive colour mixing. Red paint appears red to us because when white light strikes it, the red pigments reflect the red wavelengths of light and absorball of the wavelengths. This reflected light is what is seen by our eyes. The same is true for all of the other colours. So what about ...
Light travels very fast - at the speed of light in fact!Light travels as waves.Light travels in straight lines.- Radio. 300 gigahertz and lower. Radars, broadcasting, satellites, wireless networks, navigation and more. Planet to building-sized.
- Microwaves. Between 300 megahertz and 300 gigahertz. Weather radar, microwave cooking, broadcasting, wireless communication. Person to insect-sized.
- Infrared. Between 300 gigahertz and 430 terahertz. Thermal imagine, communication, spectroscopy, astronomy. Pinpoint. You’ve probably seen infrared light used in night vision cameras.
- Visible Light. Between 400 terahertz and 790 terahertz. Vision, digital screens, lamps, LEDs, traffic lights, skin therapy, phototherapy.
Examples of light include radio and infrared waves, visible light, ultraviolet radiation, and X-rays. Interestingly, not all light phenomena can be explained by Maxwell’s theory. Experiments performed early in the twentieth century showed that light has corpuscular, or particle-like, properties.
Aug 14, 2023 · For example, radio waves from a mobile phone, X-rays used by dentists, the energy used to cook food in your microwave, the radiant heat from red-hot objects, and the light from your television screen are forms of electromagnetic radiation that all exhibit wavelike behavior.
Nov 14, 2024 · light, electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10 −11 metre to radio waves measured in metres.
Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference . Like all electromagnetic waves, light can travel through a vacuum.
