Quantum Physics: Energy Quantization, Atomic Spectra & Photoelectric Effect
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8 Terms
What is a quanta?
The smallest discrete packet of energy.
What does it mean for energy to be quantized?
Energy exists only at specific discrete levels, not continuously.
Why do atomic emission spectra show sharp lines?
Electrons transition between specific energy levels, emitting photons with exact energies.
What is the photoelectric effect?
The photoelectric effect is the emission of electrons (photoelectrons) from a material when light shines on it, provided the light has a sufficiently high frequency
Who discovered the photoelectric effect?
Heinrich Hertz (1887).
Who explained the photoelectric effect?
Albert Einstein (1905), using photons with energy E = hν.
What new idea about light came from the photoelectric effect?
Light has particle-like behavior (wave-particle duality).
In the photoelectric effect, what does increasing light intensity (above threshold) change?
The number of electrons ejected, not their energy.
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