AP Physics 2 Flashcards: Compton Scattering

What this deck covers

This deck focuses on Compton Scattering, giving you a quick way to review the definitions, rules, and examples that matter most for AP Physics 2.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is the typical effect of Compton scattering on photon wavelength?

Answer: Increases the wavelength. Photon loses energy, so wavelength increases.

Flashcard 2: What happens to the electron in Compton scattering?

Answer: It recoils with increased kinetic energy. Electron gains momentum and kinetic energy.

Flashcard 3: Find the error: 'Compton scattering only affects visible light.'

Answer: Affects X-rays and gamma rays, not visible light. Should state high-energy photons, not just visible.

Flashcard 4: What is the term for the photon's change in direction in Compton scattering?

Answer: Scattering angle. Describes photon deflection from original path.

Flashcard 5: How does the scattering angle affect the Compton shift?

Answer: Larger angle, larger shift. Greater angle produces greater wavelength shift.

Flashcard 6: What is the significance of Compton scattering in physics?

Answer: Demonstrates particle-like behavior of light. Key evidence for photon nature of light.

Flashcard 7: Find the error: 'Compton scattering only affects visible light.'

Answer: Affects X-rays and gamma rays, not visible light. Should state high-energy photons, not just visible.

Flashcard 8: Calculate the wavelength shift for $\theta = 0^\text{o}$.

Answer: $\triangle \text{λ} = 0$. No scattering means no wavelength change.

Flashcard 9: What does $\theta$ represent in the Compton formula?

Answer: The scattering angle of the photon. Angle determines magnitude of wavelength shift.

Flashcard 10: How does electron rest mass affect the Compton shift?

Answer: It is inversely proportional to the shift. Larger mass reduces wavelength shift magnitude.

Flashcard 11: What is the primary conservation law in Compton scattering?

Answer: Conservation of energy and momentum. Both quantities conserved in elastic collision.

Flashcard 12: What is the outcome for the photon in Compton scattering?

Answer: Longer wavelength, less energy. Result of energy and momentum transfer.

Flashcard 13: What is the unit of Planck's constant?

Answer: Joule-seconds (J·s). SI unit for action in quantum mechanics.

Flashcard 14: State the relationship between wavelength and energy in photons.

Answer: Inverse relationship. $E = hf = \frac{hc}{\lambda}$ shows inverse relation.

Flashcard 15: In Compton scattering, what type of electron interaction occurs?

Answer: Elastic collision. Energy and momentum are conserved.

Flashcard 16: What is the primary conservation law in Compton scattering?

Answer: Conservation of energy and momentum. Both quantities conserved in elastic collision.

Flashcard 17: What is Compton scattering?

Answer: Interaction between a photon and an electron resulting in photon energy decrease. Demonstrates photon-electron collision with energy transfer.

Flashcard 18: What is the theoretical maximum wavelength shift in Compton scattering?

Answer: $\frac{2h}{m_e c}$ at $\theta = 180^\circ$. Backscattering gives maximum wavelength shift.

Flashcard 19: State the Compton wavelength shift formula.

Answer: $\triangle \text{λ} = \frac{h}{m_e c} (1 - \text{cos} \theta)$. Describes wavelength change based on scattering angle.

Flashcard 20: In Compton scattering, what type of electron interaction occurs?

Answer: Elastic collision. Energy and momentum are conserved.

Flashcard 21: How does the scattering angle affect the Compton shift?

Answer: Larger angle, larger shift. Greater angle produces greater wavelength shift.

Flashcard 22: Calculate the Compton shift for $\theta = 90^\text{o}$. Assume $h = 6.63 \times 10^{-34} \text{J·s}$.

Answer: $\triangle \text{λ} = \frac{h}{m_e c}$. At $90°$, $\cos(90°) = 0$, so $(1 - \cos \theta) = 1$.

Flashcard 23: What is the relationship between photon energy and frequency in Compton scattering?

Answer: Directly proportional. From $E = hf$ relationship in quantum theory.

Flashcard 24: Identify one real-world application of Compton scattering.

Answer: Medical imaging. Used in CT scans and radiation therapy.

Flashcard 25: What does the Compton effect confirm about light?

Answer: Wave-particle duality. Shows light behaves as both wave and particle.

Flashcard 26: What is the significance of $1 - \text{cos} \theta$ in the Compton formula?

Answer: Indicates dependence on scattering angle. Term determines angular dependence of shift.

Flashcard 27: What is the typical effect of Compton scattering on photon wavelength?

Answer: Increases the wavelength. Photon loses energy, so wavelength increases.

Flashcard 28: What does the Compton effect confirm about light?

Answer: Wave-particle duality. Shows light behaves as both wave and particle.

Flashcard 29: What is the typical range of photon energies for Compton scattering?

Answer: X-rays and gamma rays. High-energy photons needed for observable effect.

Flashcard 30: Calculate the Compton shift for $\theta = 90^\text{o}$. Assume $h = 6.63 \times 10^{-34} \text{J·s}$.

Answer: $\triangle \text{λ} = \frac{h}{m_e c}$. At $90°$, $\cos(90°) = 0$, so $(1 - \cos \theta) = 1$.

Flashcard 31: Calculate the wavelength shift for $\theta = 0^\text{o}$.

Answer: $\triangle \text{λ} = 0$. No scattering means no wavelength change.

Flashcard 32: What is the significance of Compton scattering in physics?

Answer: Demonstrates particle-like behavior of light. Key evidence for photon nature of light.

Flashcard 33: Which particles are typically involved in Compton scattering?

Answer: Photons and electrons. Classic example of photon-matter interaction.

Flashcard 34: Which particles are typically involved in Compton scattering?

Answer: Photons and electrons. Classic example of photon-matter interaction.

Flashcard 35: State the Compton wavelength shift formula.

Answer: $\triangle \text{λ} = \frac{h}{m_e c} (1 - \text{cos} \theta)$. Describes wavelength change based on scattering angle.

Flashcard 36: What does $\theta$ represent in the Compton formula?

Answer: The scattering angle of the photon. Angle determines magnitude of wavelength shift.

Flashcard 37: How does the Compton effect differ from the photoelectric effect?

Answer: Compton involves scattering; photoelectric involves ejection. Different mechanisms of photon-electron interaction.

Flashcard 38: What is the symbol for electron rest mass?

Answer: $m_e$. Standard notation for electron rest mass.

Flashcard 39: Identify the constant $h$ in the Compton formula.

Answer: Planck's constant. Fundamental physical constant in quantum mechanics.

Flashcard 40: In Compton scattering, which quantity remains constant for the photon?

Answer: Speed. Photon speed always equals $c$ in vacuum.

Flashcard 41: Find the error in this statement: 'Compton scattering increases photon energy.'

Answer: Photon energy decreases. Should state decrease, not increase.

Flashcard 42: What is the unit of Planck's constant?

Answer: Joule-seconds (J·s). SI unit for action in quantum mechanics.

Flashcard 43: What kind of interaction occurs between the photon and electron in Compton scattering?

Answer: Inelastic interaction. Photon loses energy to electron.

Flashcard 44: In Compton scattering, which quantity remains constant for the photon?

Answer: Speed. Photon speed always equals $c$ in vacuum.

Flashcard 45: What is the outcome for the photon in Compton scattering?

Answer: Longer wavelength, less energy. Result of energy and momentum transfer.

Flashcard 46: What is the role of $c$ in the Compton formula?

Answer: Speed of light in vacuum. Fundamental constant in relativistic equations.

Flashcard 47: What is the theoretical maximum wavelength shift in Compton scattering?

Answer: $\frac{2h}{m_e c}$ at $\theta = 180^\text{o}$. Backscattering gives maximum wavelength shift.

Flashcard 48: What is the value of the electron rest mass $m_e$?

Answer: $9.11 \times 10^{-31} \text{kg}$. Standard physical constant for electron mass.

Flashcard 49: What is the symbol for electron rest mass?

Answer: $m_e$. Standard notation for electron rest mass.

Flashcard 50: Determine the photon energy change at $\theta = 180^\text{o}$.

Answer: Maximum energy loss for photon. Backscattering gives greatest energy transfer.

Flashcard 51: Identify the constant $h$ in the Compton formula.

Answer: Planck's constant. Fundamental physical constant in quantum mechanics.

Flashcard 52: In Compton scattering, what happens to the photon's frequency?

Answer: Decreases. Energy loss means frequency reduction.

Flashcard 53: What happens to the electron in Compton scattering?

Answer: It recoils with increased kinetic energy. Electron gains momentum and kinetic energy.

Flashcard 54: How does electron rest mass affect the Compton shift?

Answer: It is inversely proportional to the shift. Larger mass reduces wavelength shift magnitude.

Flashcard 55: What is Compton scattering?

Answer: Interaction between a photon and an electron resulting in photon energy decrease. Demonstrates photon-electron collision with energy transfer.

Flashcard 56: What is the role of $c$ in the Compton formula?

Answer: Speed of light in vacuum. Fundamental constant in relativistic equations.

Flashcard 57: State the relationship between wavelength and energy in photons.

Answer: Inverse relationship. $E = hf = \frac{hc}{\lambda}$ shows inverse relation.

Flashcard 58: What is the change in photon momentum due to Compton scattering?

Answer: Depends on scattering angle $\theta$. Momentum change varies with scattering direction.

Flashcard 59: In Compton scattering, what happens to the photon's frequency?

Answer: Decreases. Energy loss means frequency reduction.

Flashcard 60: Which phenomenon does Compton scattering help to explain?

Answer: Wave-particle duality of light. Confirms light has particle properties.

Flashcard 61: Identify one real-world application of Compton scattering.

Answer: Medical imaging. Used in CT scans and radiation therapy.

Flashcard 62: What is the term for the photon's change in direction in Compton scattering?

Answer: Scattering angle. Describes photon deflection from original path.

Flashcard 63: How does the Compton effect differ from the photoelectric effect?

Answer: Compton involves scattering; photoelectric involves ejection. Different mechanisms of photon-electron interaction.

Flashcard 64: What is the typical range of photon energies for Compton scattering?

Answer: X-rays and gamma rays. High-energy photons needed for observable effect.

Flashcard 65: What does the Compton formula $\triangle \text{λ} = \frac{h}{m_e c} (1 - \text{cos} \theta)$ imply?

Answer: Wavelength shift depends on angle. Shows angle-dependent nature of interaction.

Flashcard 66: Find the error in this statement: 'Compton scattering increases photon energy.'

Answer: Photon energy decreases. Should state decrease, not increase.

Flashcard 67: What is the change in photon momentum due to Compton scattering?

Answer: Depends on scattering angle $\theta$. Momentum change varies with scattering direction.

Flashcard 68: What kind of interaction occurs between the photon and electron in Compton scattering?

Answer: Inelastic interaction. Photon loses energy to electron.

Flashcard 69: What does the Compton formula $\triangle \text{λ} = \frac{h}{m_e c} (1 - \text{cos} \theta)$ imply?

Answer: Wavelength shift depends on angle. Shows angle-dependent nature of interaction.

Flashcard 70: What is the significance of $1 - \text{cos} \theta$ in the Compton formula?

Answer: Indicates dependence on scattering angle. Term determines angular dependence of shift.

Flashcard 71: Determine the photon energy change at $\theta = 180^\text{o}$.

Answer: Maximum energy loss for photon. Backscattering gives greatest energy transfer.

Flashcard 72: What is the value of the electron rest mass $m_e$?

Answer: $9.11 \times 10^{-31} \text{kg}$. Standard physical constant for electron mass.