Draft:Quantum theory of light
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Quantum theory of light is the quantum theory that breaks the old aged view of light as either particle or wave since particles and waves were thought to be to separate phenomena. Particles and waves are entirely separate concepts in everyday life but in physics it is wave particle duality replaces this distinction between waves and particle.[1] Electromagnetic theory of light Electromagnetic wave was first hypothesized by James Clerk Maxwell
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James Clerk Maxwell in 1864 he calculated the speed of electromagnetic waves and hypothesized light as one.
that an electric field induces a magnetic field which in turn will induce an electric field and this cycle continue in a manner by which the two fields' are transverse waves
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red(electric) and blue(magnetic) are always complementary and EM can't exist without one inducing the other
Transverse wave is a wave that consists of two fields that are perpendicular to each other predicted. Maxwell had proved that light was an electromagnetic wave. In 1865 Maxwell wrote down an equation to describe these electromagnetic waves. The equation showed that different wavelengths of light appear to us as different colours.[2] He calculated and found out speed of light which is referred to as 'c' by using the formula 1/√8.85 × 10−12C2N2m2 × 1.26 × T-m/A.
Introduction
[edit]The electromagnetic theory of light failed to give explanation for:
- Blackbody radiation
- Photoelectric effect
- Compton effect
1.Blackbody radiation
[edit]From the concept that everything is emitting electromagnetic radiation constantly the question of blackbody radiation arises. Blackbody is a perfectly black body that absorbs all types of radiation including electromagnetic radiation. Blackbody radiation refers to the electromagnetic radiation emitted by it. As more energy was emitted per second at each wavelength of electromagnetic radiation which contradicts with the electromagnetic theory of light directly and also wavelength with high intensity shifts to smaller value. so plank hypothesised that an oscillating atom in a blackbody van only have a fixed values of energy in other words it is quantized.
References
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