Grade 11 Physics – Unit 1 Notes: Physics & Human Society

Book Metadata

• Textbook: Physics Student Textbook, Grade 11 (FDRE Ministry of Education, 2023)
• ISBN: 978-99990-0-034-5
• Developed by Hawassa University in collaboration with Addis Ababa, Bahir Dar & Jimma Universities; printed by GRAVITY GROUP IND LLC (Sharjah, UAE)
• Funding/Support: World Bank, FCDO (UK), Finland MFA, Royal Norwegian Embassy, UNICEF, GPE, Denmark MFA (via GEQIP-E)
• Copyright governed by Ethiopian Proclamation No. 410/2004 (Copyright & Neighboring Rights Protection)

Proper Care of the Textbook (10 Tips)

• Cover with protective material; store in a clean, dry place
• Clean hands when handling; never write/draw inside
• Use a paper/cardboard bookmark; never tear pages/pictures
• Repair tears with tape/paste; pack carefully in school bag
• Pass the book gently to others; when first opening, ease the spine by opening only a few pages at a time

Unit 1 PHYSICS AND HUMAN SOCIETY

Unit-level Competencies

• Appreciate the impact of physics on society
• Recognise roles of physics communities
• Understand how physics knowledge is created
• Identify cross-disciplinary applications
• Update oneself on current status of physics and recent discoveries

1.1 Importance of Physics to Society

• Physics provides fundamental knowledge used to create technology that improves quality of life
• Key areas benefitting from physics:
  • Transportation (cars, aircraft, spacecraft)
  • Electronics & communication (computers, smartphones, internet)
  • Health & medicine (diagnostic imaging, laser surgery, radiotherapy)
  • Energy generation (nuclear, solar, wind, hydro, geothermal)
  • Environmental monitoring (climate models, remote sensing)
• Ethical implication: dual-use technologies (e.g. nuclear energy → nuclear weapons) require responsible governance
• Classical emblem of physics–technology link: $(E = mc^2)$ underlies nuclear power & weapons
• Brainstorm prompts: “Benefit of physics for society?” and “Technologies directly related?”

Influence on Specific Sectors

• Transport: aerodynamics, propulsion, materials science allow safe, fast travel

Example: high-bypass turbofan engines rely on fluid dynamics & thermodynamics.

• Electronics: semiconductor physics → transistors → integrated circuits; quantum mechanics enables lasers, LEDs
• Health: imaging modalities—CT, MRI, PET, ultrasound—built on radiation physics, electromagnetism & acoustics

Activity 1.1

Students list physics influence on transport, health, economy, technology, etc.

1.2 Physics Communities and Their Roles

• “Physics community” = organised group of people (students, teachers, researchers, professionals) who collaborate to develop, disseminate, and apply physics knowledge
• Purposes of establishing physics communities:
  • Coordinate research & education
  • Share resources (lab equipment, computing, journals)
  • Lobby for science funding, curriculum design, policy input
  • Offer scholarships, outreach, popularisation

Example: Ethiopian Physical Society (EPS)

• Objectives:
  • Promote physics education & research in Ethiopia
  • Organise conferences; facilitate information exchange
  • Popularise physics among students & the public
  • Encourage participation in curriculum design & implementation
  • Disseminate scientific information (journals, newsletters, websites)

Activity 1.2

Discuss benefits: shared equipment, computing facilities, scholarships, mentorship, etc.

1.3 Making of Physics Knowledge

• Physics knowledge arises through both experiential and non-experiential sources, structured by the Scientific Method

Experiential (Empirical) Sources

1. Sensory perception – observations via sight, touch, hearing…
2. Introspection – internal awareness (e.g., describing pain to a doctor)
3. Memory – retention & sequencing of past experiences
4. Testimony – credible written/oral reports from others

Non-Experiential Sources

• Logic, mathematics, theoretical reasoning complement empirical data

The Scientific Method (ordered steps)

1. Observe a phenomenon & ask a question
2. Formulate a hypothesis
3. Predict measurable consequences using theory & mathematics
4. Design & perform experiments / collect data
5. Analyse data (statistics, error analysis)
6. Draw conclusions — support, refine, or refute hypothesis
7. Publish & subject to peer review; others replicate

Worked Example: Boiling Point vs. Altitude

• Experiment: measure water’s boiling temperature at various altitudes
• Sample results:
  | Altitude (m) | Boiling Point $(^{<br /> m o}C)$ |
  |-------------|-----------------------------|
  | 0 | 100 |
  | 150 | 99.5 |
  | 305 | 99 |
  | 610 | 98 |
  | 1524 | 95 |
• Analysis confirms inverse relation between ambient pressure and boiling point (explained by thermodynamics)

Intellectual Satisfaction

• Learning physics sharpens quantitative reasoning, critical thinking, and the ability to model real-world phenomena.

Activity 1.3

Students give local examples illustrating steps of the scientific method.

1.4 Mission of Physics & Career Awareness

Mission Statement

• Advance science, engineering & innovation for the benefit of all; serve society

Broad Career Categories

• Space & Astronomy
  • Astronomer, astrophysicist, telescope instrumentation engineer
  • Data analyst for missions like JWST, satellite operations
• Healthcare / Medical Physics
  • Medical imaging specialist (CT, MRI)
  • Radiation oncologist assistant / dosimetrist
  • Biomedical device designer
• Engineering
  • Mechanical, electrical, civil, aerospace engineer
  • Materials scientist, acoustical engineer
• Energy Sector
  • Nuclear plant physicist, renewable-energy analyst (wind turbine, solar farm optimisation)
  • Fusion researcher
• Technology & Computing
  • Semiconductor process engineer, laser technologist
  • Quantum computing researcher, AI hardware designer
• Geophysics & Meteorology
  • Seismologist, weather forecaster, climate modeller
• Research Scientist / Data Scientist
  • Fundamental physics labs, industry R&D, finance, analytics

(Figures in the textbook depict telescopic observation, CT-scan analysis, engineering workplaces, wind-energy farms, advanced machinery, meteorological reporting, data science.)

1.5 Current Status of Physics – Recent Discoveries & Frontiers

• Exoplanets: thousands discovered; Nobel Prize 2019 for Profs. Mayor & Queloz; techniques—radial velocity, transit photometry
• Black Hole Imaging (Event Horizon Telescope, 2019) & mathematical proof of black-hole formation (Penrose); Nobel Prize 2020 (Penrose, Genzel, Ghez)
• Quantum Cryptography: quantum key distribution (QKD) ensures theoretically un-hackable communication; satellites (e.g., China’s Micius) demonstrate global QKD links
• High-Energy Physics: Large Hadron Collider (LHC) confirms Higgs boson (2012); ongoing search for supersymmetry, dark matter, new particles; development of more powerful accelerators
• Gravitational Waves: LIGO/Virgo detected $\Delta L/L\approx10^{-21}$ strain (2015); opened gravitational-wave astronomy—binary black hole & neutron-star mergers, test of General Relativity
• Global Warming: physics of radiative transfer & atmospheric dynamics quantify anthropogenic climate change; satellite & ground measurements track $CO_2$ rise, temperature anomalies
• James Webb Space Telescope (JWST, launched 2021): 6.5-m segmented mirror operating at $(−223\,^{\circ}C)$; probing early galaxies, star formation (e.g., Carina Nebula images)
• Ethiopian Science & Art Museum (Addis Ababa, inaugurated 2022): dome-shaped interactive centre promoting STEAM education

Future Perspectives

• Quantum technologies (computing, sensing, communication)
• Nuclear fusion breakthroughs (ITER, private ventures)
• Next-generation particle colliders (Future Circular Collider ≈100 km)
• Space-based gravitational-wave observatories (LISA)
• Advanced climate intervention & renewable-energy systems

Unit Summary (key points consolidated)

• Physics underpins modern medical diagnostics, transportation, communication, defence, and environmental monitoring
• Physics communities organise knowledge exchange and advocate for science
• Scientific method provides a structured pathway from observation to theory
• Diverse careers span astronomy to data science; physics skillset is highly transferable
• Recent discoveries include exoplanets, black-hole imaging, Higgs boson, gravitational waves, quantum cryptography, and JWST observations

End-of-Unit Questions (for self-study)

1. Why is learning physics important to you personally?
2. Describe benefits you have gained from studying physics at Grade 11.
3. List ten technological advances arising from physics.
4. Explain the benefits of establishing physics communities.
5. Does your school have a physics club/community? If yes, what does it do?
6. Which process skills are essential when investigating a phenomenon?
7. Which of those skills did you personally use in a recent investigation?
8. Enumerate physics-related career opportunities that interest you.
9. Why is international collaboration crucial at the research frontier (e.g., LIGO, CERN, JWST)?

End of Notes