Introduction
In the world of physics, few discoveries are as revolutionary as Planck’s constant. Proposed by Max Planck in 1900, this tiny yet powerful value changed our understanding of energy, light, and the structure of the universe. It laid the foundation for quantum mechanics, one of modern science’s most important theories.
What Is Planck’s Constant?
Symbolized as h, Planck’s constant defines the relationship between a photon’s energy and its frequency. The formula is:
E = h × f
Where E is energy, h is Planck’s constant, and f is frequency.
This equation showed that energy is not continuous — it exists in small packets called quanta.
Why It Matters
Before Planck’s discovery, scientists believed energy flowed smoothly like water. His work revealed that it moves in discrete jumps — an insight that revolutionized physics and led to the development of quantum theory.
Applications in Modern Science
Planck’s constant is used to:
- Calculate atomic and molecular behavior
- Measure light emission and absorption
- Define the kilogram in the International System of Units
Conclusion
Planck’s constant may be incredibly small, but its impact is immense. It opened the door to understanding how the universe truly works on the smallest scales — transforming physics forever and shaping the technologies we use every day.
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