Black Body Radiation
It has been observed that any conductor when conducts current exhibit the following phenomenons
 Change in Temperture
 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 diferent frequency . The graph of I  f shows that
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 v^{2}. 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 10^{8} 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

Frequency Speed Wavelength Energy f < fo v = λ f λ = E = m v^{2} f = fo v = C = λ fo λ = E = h fo f > fo v = C = λ nfo λ = E = h nfo
Summary

Frequency Speed Wavelength Energy f < fo v = λ f λ = E = m v^{2} f = fo v = C = λ fo λ = E = h fo f > fo v = C = λ nfo λ = E = h nfo
 Every conductor has a maximum absorb energy at Threshold frequency , fo
 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.
 Energy is quantized for f > fo and can only have an integer multiply by frequency E = h f
 Short Wavelength calculated
Reference
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