Black Body Radiation: Exploring Radiated & Perpendicular Power

So, the radiated power is greater than the perpendicular power, and the power is averaged over the various angles to find the total energy transmitted.In summary, the conversation discusses the concept of radiated power and how it is greater than perpendicular power. It also mentions the use of averaging power over different angles to find the total energy transmitted. There is confusion about the overall goal and the use of cos(theta) to find the perpendicular component of the vector.
  • #1
dsdsuster
30
0
Can someone help explain what's going on here?
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/radpow.html#c1

Specifically the part about how radiated power is greater than perpendicular power.
I also don't understand why the power is being averaged over the various angles. Doesn't it make more sense to add the powers from light arriving at different angles to get the total energy transmitted?
 
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  • #2
I can't follow this very well, nothing is defined and I can't work out the overall goal.

I think it's saying that the radiation going through the specified surface from some angle is not perpendicular, so you need to use cos(theta) to find the perpendicular component of the vector.
 

1. What is black body radiation?

Black body radiation refers to the electromagnetic radiation emitted by a perfect absorber and emitter of energy, known as a black body. It is a theoretical concept used in physics to study the properties of thermal radiation.

2. How does black body radiation contribute to understanding radiated and perpendicular power?

Black body radiation is used as a reference for understanding the emission and absorption of radiation by other objects. By studying the properties of black body radiation, scientists can better understand the behavior of radiated and perpendicular power in different systems.

3. What is the difference between radiated and perpendicular power?

Radiated power refers to the total amount of energy radiated from an object, while perpendicular power specifically refers to the amount of energy that is emitted perpendicular to the surface of the object. In other words, perpendicular power is a component of radiated power.

4. How is black body radiation related to the color of objects?

The color of an object is determined by the wavelengths of light that are reflected or absorbed by the object. Black bodies are objects that absorb all wavelengths of light, making them appear black. This relationship between absorption and color is an important concept in understanding black body radiation.

5. How is black body radiation used in practical applications?

Black body radiation is used in various practical applications, such as in thermal imaging cameras, infrared sensors, and solar panels. Understanding black body radiation also plays a crucial role in fields such as astrophysics, where it is used to study the properties of stars and other celestial bodies.

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