Electricity (Part-2)

Max Planck (around 1900):
Planck is often considered the "Father of Quantum Theory." While working on the problem of blackbody radiation, he made the revolutionary proposal that energy is not emitted or absorbed continuously but in discrete packets, which he called "quanta." He formulated Planck's law, which correctly described the spectrum of blackbody radiation and introduced Planck's constant ($h$), a fundamental constant in quantum mechanics. Initially, Planck considered this quantization of energy as a mathematical trick rather than a fundamental property of nature.

The inert gas most commonly found in light bulbs is Argon (Ar). 

While other inert gases like Krypton and Xenon are used in specialized bulbs, Argon is preferred for standard incandescent light bulbs due to its effectiveness in prolonging the life of the tungsten filament and its relatively lower cost. It prevents the filament from oxidizing and slowing down its evaporation at high temperatures. Sometimes, a small percentage of Nitrogen is also added to Argon in incandescent bulbs.