# Blackbody radiation and stefans constant

• Logistics
In summary, the rate of energy radiation per unit area of a blackbody at a temperature of 260K can be calculated using the Stefan-Boltzmann constant, which is 5.67x10^-8, multiplied by the temperature raised to the fourth power, which is 260^4. This results in a value of 259.105 W/m^2. There may be confusion about the phrase "per unit area," but the hard work in deriving the constant has already been done.
Logistics
What is the rate of energy radiation per unit area of a blackbody at a temperature of 260K ?

Where's the tricky part in this question?

Surely the answer to this question can't be just

stefans constant * T^4

ie. 5.67x10^-8 * 260^4 = 259.105 W/m^2

Not every problem is tricky. The hard work was done to derive the constant. If you had been asked to that, it would be a whole different thing.

That's the question. Nothing else was asked.

What confuses me is how it says ...per unit area...in the question. So I'm thinking maybe they want some other number, I'm not sure

What's the definition of Stefan-Boltzmann's constant...?

Daniel.

## 1. What is blackbody radiation?

Blackbody radiation is the thermal radiation emitted by an object due to its temperature. It is a type of electromagnetic radiation that includes all wavelengths and is independent of the material and shape of the object.

## 2. How is blackbody radiation related to Stefan's constant?

Stefan's constant, also known as the Stefan-Boltzmann constant, is a fundamental physical constant that relates the total energy emitted by a blackbody to its temperature. It is used to calculate the amount of energy emitted per unit surface area by a blackbody at a given temperature.

## 3. What is the significance of Stefan's constant?

Stefan's constant is an important constant in physics as it helps to understand and calculate the amount of energy radiated by a blackbody at a specific temperature. It is also used in various applications, such as thermodynamics and astrophysics.

## 4. How is blackbody radiation and Stefan's constant used in practical applications?

Blackbody radiation and Stefan's constant have many practical applications, including in the design of efficient lighting systems, such as incandescent light bulbs and LEDs. They are also used in materials testing and in the study of heat transfer and energy conversion in various systems.

## 5. Is blackbody radiation and Stefan's constant a universal concept?

Yes, blackbody radiation and Stefan's constant are universal concepts in physics. They apply to all objects, regardless of their composition or shape, and are fundamental principles in understanding the behavior of thermal radiation and heat transfer.

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