Black Body Radiation – Very large energy today is sunlight. Sunlight is included in the example of black body radiation that can generate energy to the earth.

How an object can experience radiation? What are the theories that support? To find out more YukSinau.co.id will discuss it in full, let's look at the discussion below.

Definition of Black Body Radiation

Black body radiation is included in one type of thermal electromagnetic radiation that occurs around objects that are in a state of balance with their environment. The radiation has a specific spectrum and intensity that depend on differences in body temperature.

Law – The Law About Black Body Radiation

In studying black body radiation there are several laws that discuss the radiation. Some scientists are conducting research on black body radiation, through his research some scientists created several laws about black body radiation.

Which of these laws discusses several things related to this radiation. Some of these laws are as follows:

Wien's Shift Laws

Wien's Law was discovered by Wilhelm Vienna with a shift in maximum wavelength when the temperature in a black body changes. The increase in temperature of the black matter causes the maximum wavelength to be emitted. The relationship can be written in the equation below :

With :
λm = maximum wavelength
T = Absolute temperature on the object (K)
c = wien settings (2,90 x 10⁻³ mK

Stefan's Law- Boltzmann

Josef Stefan a physics scientist from Austria, showed the symptoms of black body radiation with the research he was doing. Through direct measurement it is known that radiation is influenced by the color of objects.

The discovery by Stefan was strengthened by Boltzmann , which came to be known as law Stefan- Boltzmann. And universal comparison constants σ called a constant Stefan- Boltzmann. The equation can be summarized as follows :

Information :
I = radiation intensity (Watt / m² )
P = radiation power (watt)
E = radiation energy (joule)
T = absolute temperature in matter (K)
A = area of ​​view (m²)
t = radiation time (s)
σ = konstanta Boltzmann (5,67 x 10⁻⁸ W m⁻² K⁻⁴)

Planck Quantum Theory

In the development of the theory of radiation objects that undergo major changes when Planck put forward his theory of black body radiation. From the results of observations that study the basic nature of the vibrations of molecules in the cavity wall of black objects, Planck makes conclusions ie.

Every object that experiences radiation will emit energy discrete in the form of a package- energy package. The energy packages are known as photons. The energy in each photon is directly proportional to the frequency of the radiation wave and is written in the equation below :

Information :
E = energy photon (joule)
f = photon frequency (Hz)
h = planck settings (h= 6,6 x 10⁻³⁴ )

Doppler effect for moving black objects

The change in the frequency of light from a moving source has a relationship to the observer, then the observed wave has a frequency f’

Information :
v = velocity of the source in the observer's silent framework .
θ = the angle between the velocity vector and the direction of the observer with the source reference frame.
c = speed of light.

Examples of Events

There are several examples of events related to body radiation as in the examples below :

• Greenhouse effect

Global warming causes the greenhouse effect is one of the causes of global warming. The greenhouse effect causes an increase in average earth temperature- average between 1° up to 5° C.

If if the Earth is not covered by layers of the atmosphere, the energy coming from sunlight reaching Earth reaches 800° C, especially in areas that are crossed by the equator.

• Thermal use

Flasks are included in the application of black body radiation. The working principle of the flask itself is a shiny silver / aluminum layer that can prevent heat transfer by radiation. The silver lining can reflect the radiation back in the thermos.

• Panel surya

In one solar panel, the application is for the absorption of heat energy into electrical energy. In the solar panel there are several vessels made of hollow metals and then painted in black with a panel made of glass. The heat from solar radiation can be absorbed by the black metal which can then be converted into electrical energy.

Such is the discussion of Black Radiation. Hope it can be useful for the readers. To learn other physics material, please visit the article below.

Other Articles :

• Gauss's Law
• Lenz's Law
• Electromagnetic wave
• Potential Energy Formula
• Conductor and Isolator

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