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1. **Max Planck (1900)**
* Founder of quantum theory by introducing the concept of energy quantization.
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* **Formula**: Energy quantization: $\huge \color{DeepSkyBlue} {E = h \nu}$
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2. **Albert Einstein (1905)**
* Explained the photoelectric effect, introducing the idea of photons.
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* **Formula**: Energy of a photon: $\huge \color{DeepSkyBlue} {E = h \nu}$
3. **Niels Bohr (1913)**
* Developed the Bohr model of the atom with quantized energy levels.
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* **Formula**: Energy levels of hydrogen: $\huge \color{DeepSkyBlue} {E_n = - \frac{13.6}{n^2} \text{ eV}}$
4. **Erwin Schrödinger (1926)**
* Developed Schrödinger's equation, forming the basis of wave mechanics.
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* **Formula**: Schrödinger's equation: $\huge \color{DeepSkyBlue} {i\hbar \frac{\partial}{\partial t} |\psi(t)\rangle = \hat{H} |\psi(t)\rangle}$
5. **Werner Heisenberg (1927)**
* Introduced the Uncertainty Principle, a cornerstone of quantum mechanics.
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* **Formula**: Uncertainty relation: $\huge \color{DeepSkyBlue} {\Delta x \Delta p \geq \frac{\hbar}{2}}$