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Questions and Answers
Match the labeled portions of the diagram of a wave to the correct definitions:
Match the labeled portions of the diagram of a wave to the correct definitions:
Amplitude = The height of the wave from the midline Wavelength = The distance between consecutive peaks Frequency = The number of waves passing a point per unit time
What is the frequency (in GHz) of a photon with a wavelength of 546 nm?
What is the frequency (in GHz) of a photon with a wavelength of 546 nm?
- 547.1 GHz (correct)
- 547.1 THz
- 0.55 THz
- 0.55 GHz
The photoelectric effect demonstrates light's particle properties.
The photoelectric effect demonstrates light's particle properties.
True (A)
What transition in a hydrogen atom corresponds to an electron falling from n=3 to n=1?
What transition in a hydrogen atom corresponds to an electron falling from n=3 to n=1?
According to Planck's equation, the energy of a photon is given by E = ______ x frequency.
According to Planck's equation, the energy of a photon is given by E = ______ x frequency.
What is true about the Bohr model of the atom?
What is true about the Bohr model of the atom?
Calculate the momentum (in kg·m/s) of a photon with a wavelength of 638 nm.
Calculate the momentum (in kg·m/s) of a photon with a wavelength of 638 nm.
Match each line in the atomic absorption spectrum to the corresponding transition:
Match each line in the atomic absorption spectrum to the corresponding transition:
Photons have mass.
Photons have mass.
What is the energy (in J) of the photon given off when an electron in a hydrogen atom falls from n=3 to n=1?
What is the energy (in J) of the photon given off when an electron in a hydrogen atom falls from n=3 to n=1?
Flashcards
Amplitude of a wave
Amplitude of a wave
The maximum displacement of a wave from its equilibrium position.
Wavelength of a wave
Wavelength of a wave
The distance between two consecutive corresponding points of a wave, such as two crests or two troughs.
Frequency of a wave
Frequency of a wave
The number of complete cycles of a wave that pass a given point per unit time.
Photoelectric Effect
Photoelectric Effect
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Bohr model of the atom
Bohr model of the atom
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Atomic Absorption Spectrum
Atomic Absorption Spectrum
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De Broglie Wavelength
De Broglie Wavelength
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Photon momentum
Photon momentum
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Electron Transition in Hydrogen
Electron Transition in Hydrogen
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Energy of photons
Energy of photons
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Study Notes
Wave Characteristics
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Amplitude: The maximum displacement of a wave from its equilibrium position. It's visually represented as the height of a wave crest or depth of a trough.
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Wavelength: The distance between two consecutive corresponding points of a wave, such as from crest to crest or trough to trough.
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Frequency: The number of waves that pass a fixed point in one second. It is often measured in Hertz (Hz).
Photon Energy and Frequency
- Wavelength-Frequency Relationship: The wavelength of a photon is inversely proportional to its frequency. A shorter wavelength means a higher frequency and vice versa.
Early 20th Century Experiments & Particle Properties of Light
- Key Experiment: The photoelectric effect demonstrated light's particle properties.
Bohr Model of the Atom
- Electron Energy Levels: Electrons in atoms occupy specific energy levels; they do not occupy continuous energy levels..
- Quantized Transitions: When an electron changes energy levels, it absorbs or emits a photon with a specific energy related to the difference between those levels.
Atomic Absorption Spectrum
- Electron Transitions: Each spectral line corresponds to a particular electronic transition in the atom, where energy is either absorbed or emitted during an electron's change in energy levels between orbitals.
De Broglie Wavelength
- Wave-Particle Duality: All matter possesses both wave-like and particle-like properties.
- Calculation: The de Broglie wavelength of an object is inversely proportional to its momentum. This is a quantum mechanical concept with a formula.
Momentum of Photons
- Momentum: Photons, although massless, possess momentum.
- Calculation: The momentum of a photon is inversely proportional to its wavelength.
Energy of Photons and Electron Transitions in Hydrogen Atom
- Photon Emission/Absorption: Electrons changing energy levels in atoms either absorb or emit photons. The energy of the photon is equal to the energy difference between the energy levels.
- Calculations: The calculation involves the difference in energy levels along with constants, such as Planck's constant.
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