Parent plan · Week 22 · Modern Physics — connect, calculate and revise — Physics & Environmental Science
Parent teaching plan · 36 weeksUnits to teach or revisit
Chapter 7 · Modern Physics
- Unit 7.1 · Photons, Photoelectric Effect & Wave–Particle Models
- Unit 7.2 · Relativity, Light Speed & Model Limits
Assigned readings
Develop this chapter question: Which observations require models beyond everyday mechanics?
This week’s goals
- Explain models, objects, arrows and axes before substituting values.
- Conserve the relevant charge, momentum, matter and energy account.
- Apply independently, state limits and revise from evidence.
Read The right model depends on the evidence and the event at chapter launch and revisit it alongside this week’s linked units, figures and investigation.
Five flexible sessions, normally 50–60 minutes. Two core unit sessions are scheduled, with a third for selected demanding topics. Sample week uses a complete 90-minute paper plus about 30 minutes of corrections within two ordinary-hour equivalents.
Session 1 · Photoelectric Model from Data — calculate, explain and revise
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Calculate/graph the records with correct labels. Answer the analysis questions, compare an alternative account, revise the model and submit a report with evidence, uncertainty and next test.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its quantities and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the objects, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
The work function is 2 eV. Above threshold Kmax=Ephoton−2 eV; a 1.5 eV photon lacks sufficient energy. Higher intensity at 3 eV gives more electrons but the same maximum energy. Multiphoton regimes are outside this model. Preserve the original observations, intermediate working and a labeled mechanism. Report the relevant boundary and model assumptions, discuss an alternative explanation, and identify the next useful measurement; do not replace unexpected data with the illustrative record.
- Use the supplied evidence and correct quantity/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 2 · Consolidation — Photons, Photoelectric Effect & Wave–Particle Models
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Use marked evidence to choose a real gap: redraw and explain a figure, complete a new calculation or compare an alternative mechanism. If secure, design a further test and identify its controls. A material has work function 2.2 eV. Photons carry 3.7 eV. Find Kmax in eV and joules, and stopping-potential magnitude.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its quantities and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the objects, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
Kmax=1.5 eV=2.403×10⁻¹⁹ J; stopping-potential magnitude=1.5 V. At fixed photon energy, increasing intensity changes available electron number rather than this maximum.
- Use the supplied evidence and correct quantity/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 3 · Consolidation — Relativity, Light Speed & Model Limits
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Use marked evidence to choose a real gap: redraw and explain a figure, complete a new calculation or compare an alternative mechanism. If secure, design a further test and identify its controls. A process has proper duration 3.0 μs and moves at 0.80c relative to a lab. Find γ and lab duration; a rest 10 m object moving parallel at that speed has what lab length?
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its quantities and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the objects, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
γ=1/√0.36=5/3. Lab duration=5.0 μs; length=10/(5/3)=6.0 m, with simultaneous endpoints in the lab.
- Use the supplied evidence and correct quantity/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 4 · Chapter review and targeted correction
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Attempt the full chapter review before consulting guidance. Include the changed transfer cases and explain why an earlier error occurred. Select further practice from marked evidence.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its quantities and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the objects, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
Use each item’s supplied worked guidance and criteria; retain both an independent attempt and an explained correction.
- Use the supplied evidence and correct quantity/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Session 5 · Chapter quiz and human marking
Use the linked chapter reading, unit explanations, figures and notebook.
Your task
Attempt the complete chapter quiz independently. Mark objective answers afterward and have a parent/teacher judge written explanations using the criteria. Discuss priority corrections.
- Prepare the assigned explanation and identify the question.
- Trace a model or graph, labeling its quantities and units.
- Attempt the assigned reasoning and calculation before opening guidance.
- Compare with criteria and retain an explained correction.
Hint and response guidance
Name the objects, quantities, boundary and assumptions before choosing a relationship. Use the matching figure to check each step.
A correct unsupported number does not replace the requested reasoning. Use the item criteria and preserve examples of independent work.
- Use the supplied evidence and correct quantity/units.
- Explain the relevant mechanism or relationship.
- Show intermediate working or a labeled model.
- State an assumption, limitation or useful next test.
Submit this week
- Labeled first/revised models and intermediate calculations.
- Assigned practice and assessed attempts with explained corrections.
- Investigation record/report when assigned, identifying supplied versus collected data.
Parent / teacher weekly conference
Use actual written work to adjust support. Do not count a copied solution as independent mastery. Extend or redistribute time where needed; home-study records do not certify supervised or mandated laboratory requirements.
- Can each relevant symbol and unit be explained?
- Does the calculation conserve the appropriate quantities?
- Can the learner solve a changed case and explain an assumption?