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Why are the supergiant stars so bright even though they are not very hot?
A relatively low surface temperature means that reg giants radiate relatively little energy per area unit, but since they have a very large surface area, the total amount of energy radiated is enormous.
If a red star and a white star radiate energy at the same rate can they be the same size If not which must be the largest Why?
They cannot be the same size. The red star must be larger. Red stars are cooler that blue stars and so radiate less energy for a given amount of surface area. In order to radiate the same amount of energy as a blue star, the red star must therefore have a larger surface area.
How do the wavelength of radiant energy vary with the temperature of the radiating source how does this effect solar terrestrial radiation?
The wavelength of radiant energy emitted by a source is inversely related to its temperature, described by Wien's displacement law; as the temperature increases, the peak wavelength of the emitted radiation decreases. This means hotter objects emit shorter wavelengths, moving from infrared toward visible light. In terms of solar-terrestrial radiation, the Sun, with a surface temperature of about 5,500°C, emits primarily in the visible spectrum, while the Earth, with a much lower temperature, emits infrared radiation. This difference is crucial for understanding how solar energy is absorbed and re-radiated by the Earth, influencing climate and energy balance.
Do planets reflect or radiate energy?
Plants both reflect and radiate energy, but in different ways and at different wavelengths: Reflection: Plants reflect energy primarily in the visible and near-infrared (NIR) parts of the electromagnetic spectrum. In the visible spectrum, chlorophyll absorbs mostly blue and red light for photosynthesis, but reflects green light — which is why most plants appear green. In the NIR range, plants reflect a significant amount of energy. This reflection helps regulate temperature and avoid overheating, as NIR energy doesn't contribute to photosynthesis. Radiation: Plants also radiate thermal (infrared) energy, just like any other object with a temperature above absolute zero. This radiation typically occurs in the mid- to far-infrared spectrum (thermal IR), corresponding to the plant’s temperature (usually around 290–310 K or 17–37 °C). This is how thermal imaging can detect plant temperature and stress. So in summary: Reflect: visible (especially green) and NIR light Radiate: thermal infrared energy (heat) #JAIDIXIT
Why not earth radiate light?
Earth does radiate light in the form of thermal radiation, which is emitted as heat energy. This radiation is typically in the infrared range and is a result of the Earth's surface absorbing sunlight and then re-emitting it as heat.
What objects can radiate energy?
Objects that can radiate energy include stars, light bulbs, heated coils, and the Earth's surface. The type of radiation (such as heat, light, or electromagnetic waves) emitted by an object depends on its temperature and composition.
Do hotter stars radiate more energy at higher frequencies?
Yes, hotter stars radiate more energy overall, with a greater proportion emitted at higher frequencies. This is due to the relationship between temperature and the peak wavelength of light emitted, known as Wien's Law. As a star's temperature increases, the peak wavelength shifts towards shorter, higher-energy wavelengths.
If the inner accretion disk around a black hole has a temperature of 1000000 K at what wavelength will it radiate the most energy?
For a thermal radiation source, the peak of the blackbody radiation curve is at a photon energy 2.8 times the temperature in electron-volts. The temperature in electron-volts is 1/11,600 times the temperature in Kelvin. Use E = hv to convert from the photon energy (E) to photon frequency, using Plank's constant h. Use v = c/(lambda) to convert from the photon frequency to the wavelength. The result: these hot plasmas radiate X-rays, and the peak wavelength is about 50 Angstroms, i.e. 5 nm.
What form of energy in energy of house lights?
House lights radiate energy as electromagnetic waves in the wavelength bands of heat and visible light.
Human body temperature is about 310 K 98.6 degree F At wavelength do humans radiate the most energy What kind of radiation do you emit?
The peak wavelength at which humans radiate the most energy is around 10 micrometers in the infrared spectrum, which is in the thermal radiation range. Human bodies primarily emit thermal radiation due to their temperature, with the majority falling within the infrared portion of the electromagnetic spectrum.
What is the giant star?
The largest stars - that is, largest in diameter - are usually red. This is related to the fact that their surface temperature is relatively low. They still radiate huge amounts of energy though, due to their large surface.
What color is the giant star?
The largest stars - that is, largest in diameter - are usually red. This is related to the fact that their surface temperature is relatively low. They still radiate huge amounts of energy though, due to their large surface.
Why do dark surface3s radiate heat better?
Because they absorb them better. If a surface were to absorb a certain radiation very well and not radiate it well, an apparatus could be made that violates the Second Law of Thermodynamics (creating a temperature difference where none existed previously). Therefore, it is not possible. You might also say that the dark surface is "transparent in both directions" (in and out). This is for a specific radiation; on the other hand, it is possible to have surfaces that radiate and absorb electromagnetic waves of one frequency well, and not so well at other frequencies.
Do all objects radiate?
no...
What temperature would an object radiate the least amount of electromagnetic energy?
An object would radiate the least amount of electromagnetic energy at absolute zero temperature, which is 0 Kelvin (-273.15 degrees Celsius). At this temperature, the object would have minimal thermal motion and therefore emit minimal radiation.
A newly formed protostar will radiate primarily at which wavelength?
A newly formed protostar will radiate primarily in the infrared wavelength range. This is because the protostar is still in the process of contracting and heating up, emitting energy as thermal radiation at longer wavelengths as it evolves towards becoming a main sequence star.
Why are the supergiant stars so bright even though they are not very hot?
A relatively low surface temperature means that reg giants radiate relatively little energy per area unit, but since they have a very large surface area, the total amount of energy radiated is enormous.
