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Karimspencer
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For example when you make a laser , does heat come with it?
Heat is the flow of energy I thought. As in energy transfer. Temperature, as opposed to heat, is the way to quantitatively describe energy level increase in particles after heat has been transferred, so I don't think you would say light is converted to heat, but rather converted to temperature increase. Heat would be the process of light energy converted to thermal energy, or in other words heat is the amount of energy that has been transferred to thermal energy.Khashishi said:Your questions indicate that you are confused about what heat is. Heat is basically energy, but the exact definition depends on the physical context. If you get into the nitty gritty, heat is a pretty difficult subject.
Heat is energy that is more or less randomly distributed across all the degrees of freedom within a system. In typical terrestrial situations, that means most of the energy is in random kinetic motion of the molecules, as well as various vibrational and rotational modes of the molecules. For typical terrestrial situations, very little heat energy is in the form of light.
On the other hand, in a vacuum, most of the heat energy could be in the form of light, because without any other particles, photons are the main degrees of freedom of the system.
If you shine a light on something on Earth, then the light is not considered heat because it doesn't randomly occupy all the degrees of freedom of the air that it is traveling through. But, after the light is absorbed by various materials, it is converted to heat.
Not necessarily and even if it does, it wouldn't necessarily heat up in an amount equal to the light's energy. A solar panel, for example, converts some light directly into electrical energy.Karimspencer said:Okay let's say you concentrate any kind of light on an object would lt heat up russ
Yes, all visible radiations have heat. Visible radiation is a form of electromagnetic radiation, and all forms of electromagnetic radiation carry energy, which can be perceived as heat.
No, visible radiations also carry other forms of energy such as light and infrared radiation. Heat is just one type of energy carried by visible radiations.
Yes, different types of visible radiations carry different amounts of heat. This is because the amount of heat carried is directly related to the wavelength of the radiation. Longer wavelengths (such as those in the infrared spectrum) carry more heat compared to shorter wavelengths (such as those in the visible spectrum).
No, shorter wavelengths do not necessarily carry more heat than longer wavelengths. As mentioned, the amount of heat carried is directly related to the wavelength, but there are other factors that can affect the amount of heat, such as intensity and duration of exposure.
No, visible radiation is not the only source of heat on Earth. Other sources of heat include conduction, convection, and radiation from other wavelengths such as infrared and ultraviolet.