Unit 15 | AP Physics 2

Physics 2 Test Booklet Notes

Section 1: Atomic Structure and Properties

• Graph of Electron-Nucleus Attraction:
    - The graph demonstrates how the attractive force between an electron and a bare nucleus varies with distance.
    - Possible representations for the nucleus include labels (A), (B), (C), and (D).
  

• Lithium Ion Formation:
    - A lithium atom with a net charge can be transformed by:
      - (A) Removing two electrons from a neutral lithium atom.
      - (B) Adding two electrons to a neutral lithium atom.
      - (C) Adding two protons to a neutral lithium atom.
      - (D) Removing one electron and adding one proton to a neutral lithium atom.
      - Correct Answer: Remove one electron and add one proton (D).

• Atom Mass Calculation:
    - A neutral atom has a mass represented by a notation (A), (B), (C), (D). Determine the most accurate mass approximation for given isotopes.

• Ranking Neutron Count:
    - Given notation for three atomic nuclei, rank the number of neutrons in the three:
      - Possible answers include choices (A), (B), (C), and (D).

• Identifying Isotope Properties:
    - To distinguish different isotopes of the same element, consider:
      - (A) Mass of the nucleus
      - (B) Net charge of the nucleus
      - (C) Net charge of the atom or ion
      - (D) Number of electrons in the atom or ion.

Section 2: Blackbody Radiation

• Modeling Objects:
    - Objects 1 and 2 modeled as blackbodies with respective temperatures and surface areas.
    - Comparison of total radiated power and peak wavelength:
      - Analyze possibilities (A), (B), (C), (D).

• Blackbody Temperature Graph:
    - Evaluate the graph representing intensity of blackbody radiation per unit wavelength as a function of absolute temperature.

• Star Evolution Dynamics:
    - A star, modeled as a spherical blackbody, decreases its radius to one-third while doubling surface temperature:
      - Evaluate power changes based on radius and temperature effects. Options:
        - (A) Power increases due to radius decrease being stronger than temperature increase.
        - (B) Power increases more due to temperature increase.
        - (C) Power decrease due to radius effect.
        - (D) Power decrease favored by temperature.

• Thermal Equilibrium of Blackbody:
    - Statement about a blackbody at equilibrium:
      - (A) Transmits all radiation, emits none.
      - (B) Reflects all, emits none.
      - (C) Absorbs all radiation, emitting at the same rate.
      - (D) Reflects all, emits at the rate reflected.

• Spherical Blackbodies Comparison:
    - Two blackbodies at the same temperature:
      - (A) One with a greater mass; analyze claims about peak wavelength.

Section 3: Photon Behavior and Particle Interactions

• Photon Collisions:
    - Scattering event of photon with stationary electron; resulting velocity components analyzed: (A), (B), (C), (D).

• Conservation during Scattering:
    - Effects of scattering on photon and particle momentum discussed through alternative particle interactions.

• Photoelectric Effect:
    - Emission of electrons from surface due to incident photons, detailing kinetic energy range comparisons under varying power.

• Energy Transfer Analysis:
    - Photon wavelength impact on scattered photons; reactions at various angles and energy considerations listed.

• Radiative Decay Types:
    - Cobalt nucleus remains stable in decay; options detail beta-minus or gamma decay effects.

Section 4: Radioactive Decay Quantifications

• Radioactive Decay Rate/Time Calculations:
    - Decay constants and remaining atoms calculations between samples across various isotopes.
    - Application of half-life considerations over distinct periods.

• Comparison of Kinetic Energies in Decay:
    - Kinetic energy relationships in alpha versus beta decay considered.

Section 5: Quantum Mechanics and Energy Levels

• Photon Emission and Absorption Events:
    - Examination of energy state transitions and allowed photon interactions.

• Kinetic Energy of Emitted Electrons:
    - Analysis of the relationship between emitted electron speeds post photon interaction.

• Wavelength and Frequency Relations:
    - Corresponding energy calculations to establish photon transition limits.

• Graphical Representations:
    - Interpret the slope relationships in kinetic energy versus frequency graphs showing photoelectric incidences.

Conclusion: These notes encompass a detailed understanding of atomic properties, blackbody radiation, photon interactions, radioactive decay processes, and quantum mechanical principles vital for AP Physics 2 mastery.