SS3 Second Term Physics Lesson Note – Energy Quantization

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WEEK THREE

ENERGY QUANTIZATION

• Energy quantization
• Energy levels in atom
• Photo-electric effect
• Einstein Photo Electric Equation and its explanation
• Thermionic emission
• X-ray
• Duality of matter – wave particle duality

Energy quantization

Bohr suggested that the electron in the atom exist in discrete energy known as quantization which can be removed from one level to the other. Energy in such bodies is emitted in separate or discrete energy packet called energy quanta (E₀)

Energy levels in atom

Electrons in atoms are arranged around their nuclei in position known as energy level or electron shell. It requires more energy to remove electrons from the first energy level than to remove electrons from any of the other higher levels. The energy of an electron is given by the relation:

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