## Radiative Equilibrium Temperature Calculator

## FAQs

**Is Stefan-Boltzmann law correct?** Yes, the Stefan-Boltzmann law is a fundamental law of physics that accurately describes the relationship between the radiated power of a black body and its temperature.

**What is the Stefan-Boltzmann law of thermal radiation?** The Stefan-Boltzmann law of thermal radiation describes how the total energy radiated by a black body is directly proportional to the fourth power of its absolute temperature.

**What is the relationship between thermal radiation and temperature?** The relationship between thermal radiation and temperature is described by the Stefan-Boltzmann law, which states that the radiated power of a black body is directly proportional to the fourth power of its temperature.

**What is the temperature of thermal radiation?** The temperature of thermal radiation depends on the temperature of the emitting object. Thermal radiation occurs at a temperature above absolute zero.

**What are the two laws of thermal radiation?** The two fundamental laws of thermal radiation are:

- Kirchhoff’s law, which states that for an object in thermal equilibrium, its emissivity is equal to its absorptivity.
- Stefan-Boltzmann law, which describes the relationship between radiated power, temperature, and the Stefan-Boltzmann constant.

**Is the Sun a black body?** The Sun is not a perfect black body, but it is often approximated as one in many physics calculations.

**What are the three temperature equations?** The three temperature equations mentioned are commonly used to convert temperatures between different scales: Celsius (°C), Kelvin (K), and Fahrenheit (°F).

**What is the radiative temperature of the Earth?** The radiative temperature of Earth depends on various factors and is not a single fixed value. Earth’s average surface temperature is about 288 Kelvin (15°C or 59°F).

**How do you calculate the equilibrium temperature of a planet?** The equilibrium temperature of a planet can be estimated using the Stefan-Boltzmann law, taking into account the planet’s distance from its star, the star’s luminosity, and the planet’s albedo (reflectivity).

**How cold would Earth be without an atmosphere?** Without an atmosphere, Earth’s surface temperature would be much colder, close to its radiative equilibrium temperature of approximately 255 Kelvin (-18°C or 0°F).

**What does the Stefan-Boltzmann law apply to?** The Stefan-Boltzmann law applies to black bodies, which are theoretical objects that absorb and emit all incoming radiation. It describes the relationship between radiated power and temperature.

**What is emissivity of a black body?** The emissivity of a black body is equal to 1, meaning it emits all incoming radiation. A black body is a perfect emitter.

**What is the Stefan-Boltzmann law of equilibrium temperature?** The Stefan-Boltzmann law can be used to estimate the equilibrium temperature of celestial bodies by considering the balance of incoming and outgoing radiation.

**What is the highest energy electromagnetic wave?** The highest energy electromagnetic waves are gamma rays, which have the shortest wavelength and the highest frequency in the electromagnetic spectrum.

**At what temperature do all bodies radiate electromagnetic radiation?** All bodies radiate electromagnetic radiation at temperatures above absolute zero (0 Kelvin). The intensity and spectrum of radiation depend on the temperature.

**What is re-radiated heat from Earth called?** Re-radiated heat from Earth is called terrestrial or longwave radiation. It consists of infrared radiation emitted by the Earth’s surface and absorbed and re-emitted by greenhouse gases in the atmosphere.

**What is the difference between radiation and thermal radiation?** Radiation is the emission and transmission of energy in the form of electromagnetic waves. Thermal radiation specifically refers to the emission of electromagnetic waves due to the temperature of an object.

**What are the 4 laws of thermal radiation?** The four fundamental laws of thermal radiation are:

- Kirchhoff’s law of thermal radiation.
- Stefan-Boltzmann law.
- Planck’s law of black-body radiation.
- Wien’s displacement law.

**What law does thermal radiation obey?** Thermal radiation obeys the Stefan-Boltzmann law, which describes the relationship between radiated power and temperature.

**What is the first law of thermal radiation?** The first law of thermal radiation is Kirchhoff’s law, which states that for a given body in thermal equilibrium, its emissivity is equal to its absorptivity.

**What happens to wavelength when temperature increases?** As temperature increases, the peak wavelength of emitted radiation decreases according to Wien’s displacement law. Higher temperatures result in shorter wavelengths.

**What is Wien’s displacement law?** Wien’s displacement law states that the wavelength of the peak intensity of radiation emitted by a black body is inversely proportional to its absolute temperature.

**Why isn’t the Earth a blackbody?** The Earth is not a perfect black body because it does not absorb and emit all radiation in all wavelengths with perfect efficiency. Earth’s surface and atmosphere have varying emissivities and absorption characteristics.

**What is Planck’s quantum hypothesis of radiation?** Planck’s quantum hypothesis of radiation is a theory that describes the quantization of energy in electromagnetic radiation. It is a fundamental concept in quantum mechanics.

**What color is the Sun to humans?** The Sun appears white to humans when viewed from space. However, when viewed from Earth’s surface, its color appears yellow or orange due to the scattering of shorter wavelengths by the atmosphere.

**What is Wien’s constant?** Wien’s constant is a fundamental constant in physics and is equal to approximately 2.898×10−3 m K2.898×10−3m K. It is used in Wien’s displacement law to relate temperature and the peak wavelength of black-body radiation.

**What if you know a star’s temperature and use the Stefan-Boltzmann law you can find?** If you know a star’s temperature and use the Stefan-Boltzmann law, you can find the star’s luminosity, which is the total energy it radiates per unit of time.

**What is the temperature of absolute zero?** Absolute zero is the lowest temperature theoretically achievable, and it is equivalent to 0 Kelvin (-273.15°C or -459.67°F).

**What temperature is 21°C?** 21°C is equivalent to 294.15 Kelvin (K) and 69.8°F on the Fahrenheit scale.

**What is the third law of temperature?** There is no widely recognized “third law of temperature.” The laws of thermodynamics typically include the zeroth, first, second, and third laws, with the third law focusing on absolute zero and entropy.

GEG Calculators is a comprehensive online platform that offers a wide range of calculators to cater to various needs. With over 300 calculators covering finance, health, science, mathematics, and more, GEG Calculators provides users with accurate and convenient tools for everyday calculations. The website’s user-friendly interface ensures easy navigation and accessibility, making it suitable for people from all walks of life. Whether it’s financial planning, health assessments, or educational purposes, GEG Calculators has a calculator to suit every requirement. With its reliable and up-to-date calculations, GEG Calculators has become a go-to resource for individuals, professionals, and students seeking quick and precise results for their calculations.