Physics Course/Radiation/Black Body Radiation

Black Body Radiation
It has been observed that any conductor when conducts current exhibit the following phenomenons
 * 1) Change in Temperture
 * 2) Radiate Light of Radiant Heat Energy

This is known as Black Body Radiation

Experiment
Connect voltage source with a conductor in a closed loop. Measured the value of current at different frequency. The graph of I - f shows that
 * Wiens_law.svg

Observations
Radiant Heat energy is a wave travels at speed v = λ f at all frequencies f less than fo carries an energy level E = m v2. At fo, Radiant Heat energy reaches its peak value and travels with speed equals to speed of light in the vaccum v = C = 3 x 108 carries an energy level E = h fo. At any frequencies greater than fo, Radiant Heat energy remain the same for all frequency f > fo carries an energy level E = h nfo


 * {| class="wikitable" width=100% align=left

! Frequency !! Speed !! Wavelength !! Energy
 * f < fo || v = λ f || λ = $$\frac{v}{f}$$ || E = m v2
 * f = fo || v = C = λ fo || λ = $$\frac{C}{fo}$$ || E = h fo
 * f > fo || v = C = λ nfo || λ = $$\frac{C}{nfo}$$ || E = h nfo
 * }
 * f > fo || v = C = λ nfo || λ = $$\frac{C}{nfo}$$ || E = h nfo
 * }
 * }
 * }

Summary

 * {| class="wikitable" width=100% align=left

! Frequency !! Speed !! Wavelength !! Energy
 * f < fo || v = λ f || λ = $$\frac{v}{f}$$ || E = m v2
 * f = fo || v = C = λ fo || λ = $$\frac{C}{fo}$$ || E = h fo
 * f > fo || v = C = λ nfo || λ = $$\frac{C}{nfo}$$ || E = h nfo
 * }
 * f > fo || v = C = λ nfo || λ = $$\frac{C}{nfo}$$ || E = h nfo
 * }
 * }
 * }


 * 1) Every conductor has a maximum absorb energy at Threshold frequency, fo 
 * 2) Light Wave of Radiant Heat Energy radiates from any current conducting material has a Particle Wave Duality Characteristic . Sometimes it behaves like Particle, sometimes it behaves like Wave.
 * 3) Energy is quantized for f > fo and can only have an integer multiply by frequency E = h f
 * 4) Short Wavelength calculated $$\lambda = \frac{C}{f}$$

Reference

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