Modern Physics: Light, Atoms, and Quanta

Name: Modern Physics: Light, Atoms, and Quanta
Author: Arnie

Light is a wave. But light is also a stream of tiny packets of energy. How do we know? In this course we follow the experiments that surprised physicists. First the photoelectric effect and Einstein's equation. Then Bohr's model of the hydrogen atom, and the coloured lines in its spectrum. Every calculation is also done in Python. For Class 12.

3 lessons, about 1 h 20 min3 simulations8 problems6 practice questionsPython in every lesson

Created by Dr. Arnie

Course outline (3 lessons)

Lesson 1about 30 min
The Photoelectric Effect
Light can knock electrons out of a metal. The details show that light comes in packets of energy called photons.
1 simulation2 practice questions2 Python programs4 problems1 Python lab1 question set
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Lesson 2about 25 min
Bohr's Model of the Hydrogen Atom
Bohr explained the coloured lines of hydrogen by allowing the electron only certain orbits and certain energies.
1 simulation2 practice questions1 Python program4 problems1 Python lab1 question set
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Lesson 3about 25 min
Matter Waves: the de Broglie Wavelength
Light behaves as a wave and as a stream of photons. De Broglie said that particles, too, have a wavelength, $\lambda = \dfrac{h}{p}$ . An electron speeded up through $V$ volts has $\lambda = \dfrac{1.227}{\sqrt{V}}\ \text{nm}$ , about the spacing of atoms, so crystals diffract electrons. A whole number of these wavelengths fits round each of Bohr's orbits.
1 simulation2 practice questions1 Python program1 note
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Test Your Learning

Modern Physics: Photons and Atoms Challenge Test

12 questions · 25 min

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Class 11–12 Physics Practice Test: Circuits, Waves and Modern Physics

15 questions · 20 min

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Your teacher

Dr. Arnie

Ph.D · Assistant Professor (Physics)

← Light and Atoms

More onModern Physics › Dual Nature of Radiation and Matter Modern Physics › Atoms and Atomic Spectra

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Modern Physics: Light, Atoms, and Quanta

Course outline (3 lessons)

The Photoelectric Effect

Bohr's Model of the Hydrogen Atom

Matter Waves: the de Broglie Wavelength

Test Your Learning

Your teacher

Discussion (0)