https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:transfer-of-thermal-energy/x0e04e0cb682fb793:thermal-radiation/v/radiation-ur 2025-08-08T00:24:37.843818748Z Radiation Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Radiation Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/8TLzTvs075Q.mp4/8TLzTvs075Q.mp4 112 Thermal Radiation https://www.khanacademy.org/science/ap-physics-2/x0e2f5a2c:modern-physics/x0e2f5a2c:atoms-and-light/v/blackbody_radiation 2024-06-14T17:21:05.861633961Z Blackbody radiation A blackbody is an idealized object that absorbs all electromagnetic radiation (light) that shines on it. Blackbodies do not perpetually warm up as they absorb light because the accelerating charged particles inside them radiate their own light. The spectrum radiated by a blackbody depends only on its temperature. The hotter a blackbody is, the more intense its radiation is, and the shorter its peak wavelength is. The relationship between temperature and spectrum is used to estimate a star's surface temperature based on its color. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/ea79b022-d8be-49d5-9da6-6929ca4d244b_1280_720_base.png Blackbody radiation A blackbody is an idealized object that absorbs all electromagnetic radiation (light) that shines on it. Blackbodies do not perpetually warm up as they absorb light because the accelerating charged particles inside them radiate their own light. The spectrum radiated by a blackbody depends only on its temperature. The hotter a blackbody is, the more intense its radiation is, and the shorter its peak wavelength is. The relationship between temperature and spectrum is used to estimate a star's surface temperature based on its color. https://cdn.kastatic.org/ka-youtube-converted/DHG61XPuWyk.mp4/DHG61XPuWyk.mp4 858 Thermal Radiation https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:global-change/x0b0e430a38ebd23f:greenhouse-effect/v/greenhouse-effect-and-greenhouse-gases 2024-06-28T21:00:15.59562973Z Greenhouse effect and greenhouse gases The greenhouse effect, driven by gases like carbon dioxide, methane, and water vapor, is essential for maintaining Earth's habitable temperatures. However, excessive concentrations of these gases—particularly due to human activities—can lead to global warming and climate change. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/27e417aa-bb45-422d-bb99-7e0e28da1250_1280_720_base.png Greenhouse effect and greenhouse gases The greenhouse effect, driven by gases like carbon dioxide, methane, and water vapor, is essential for maintaining Earth's habitable temperatures. However, excessive concentrations of these gases—particularly due to human activities—can lead to global warming and climate change. https://cdn.kastatic.org/ka-youtube-converted/YpfxiDktSoI.mp4/YpfxiDktSoI.mp4 419 Thermal Radiation https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:transfer-of-thermal-energy/x0e04e0cb682fb793:thermal-radiation/v/the-_greenhouse_effect 2024-06-16T20:56:57.951759647Z The greenhouse effect Earth receives a spectrum of electromagnetic radiation from the Sun which peaks in the visible range. Some of this light makes it to Earth's surface and is absorbed. The absorbed light is converted to thermal vibrations of charged particles, which then radiate infrared light. Greenhouse gases in the atmosphere (including carbon dioxide, methane, and water vapor) absorb the infrared light and then re-emit it in random directions. Some escapes to space, and some remains trapped in the atmosphere. The greenhouse effect keeps Earth warm enough to be habitable. However, human activities are increasing greenhouse gas concentrations and are thereby affecting Earth's climate system. Solutions to this problem include solar, wind, and nuclear energy, which do not emit greenhouse gases during operation. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/4b17ace8-7bca-436f-a549-ed079209c44f_1280_720_base.png The greenhouse effect Earth receives a spectrum of electromagnetic radiation from the Sun which peaks in the visible range. Some of this light makes it to Earth's surface and is absorbed. The absorbed light is converted to thermal vibrations of charged particles, which then radiate infrared light. Greenhouse gases in the atmosphere (including carbon dioxide, methane, and water vapor) absorb the infrared light and then re-emit it in random directions. Some escapes to space, and some remains trapped in the atmosphere. The greenhouse effect keeps Earth warm enough to be habitable. However, human activities are increasing greenhouse gas concentrations and are thereby affecting Earth's climate system. Solutions to this problem include solar, wind, and nuclear energy, which do not emit greenhouse gases during operation. https://cdn.kastatic.org/ka-youtube-converted/Yn7ICU3Q4mE.mp4/Yn7ICU3Q4mE.mp4 808 Thermal Radiation https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:global-change/x0b0e430a38ebd23f:greenhouse-effect/e/greenhouse-effect 2026-04-15T05:40:45.550331962Z Greenhouse effect Apply your understanding of greenhouse effect in this set of free practice questions aligned to AP standards. exercise