Oscillation that transfers energy
A wave transfers energy and information without net transfer of matter. Distinguish amplitude, wavelength, period, and frequency.
Greek Gymnasium Grade 3 / Physics / Curriculum
Διάθλαση και χρώμα: structured theory, worked examples, answered practice, and a mastery checklist for Greek Gymnasium Grade 3.
Unit
The essential chapter ideas in a clear sequence before practice.
A wave transfers energy and information without net transfer of matter. Distinguish amplitude, wavelength, period, and frequency.
The relation v = fλ connects the medium and the oscillation. At a boundary, source frequency stays fixed while speed and wavelength may change.
Use the normal, angles, and wavefronts. Superposition adds displacements without permanently changing the component waves.
Physics
Follow the method step by step and check why every step is valid.
A wave has frequency 4 Hz and wavelength 3 m. Find its speed.
Physics
Connect formulae to phenomena, write units correctly, and explain results.
The structure follows the official textbook layout and is used to organise study.
The areas that usually create mistakes or need extra revision.
v = 12 m/s
Before calculating, explain the key idea from “Διάθλαση” and which conditions must be checked.
The answer should show not only which rule is used for “Διάθλαση”, but also why it is valid here.
Διάθλαση και χρώμα
Try independently, use the hint if needed, then open the answer guide.
1. Explain the idea and give one correct foundation example for “Διάθλαση”.
Write known quantities in SI units, draw a diagram where useful, and state the law before substitution.
A complete answer links “Διάθλαση” to a physical law or model, correct units, and an interpretation.
2. Solve an application and show every intermediate step for “Ανάλυση λευκού φωτός”.
Write known quantities in SI units, draw a diagram where useful, and state the law before substitution.
A complete answer links “Ανάλυση λευκού φωτός” to a physical law or model, correct units, and an interpretation.
3. Compare a correct and an incorrect approach and justify the difference for “Χρώματα”.
Write known quantities in SI units, draw a diagram where useful, and state the law before substitution.
A complete answer links “Χρώματα” to a physical law or model, correct units, and an interpretation.
Where to start: textbook, daily material, PDFs, videos, and worked examples.
Targeted practice before full tests so coverage is clear.
How to measure progress in this chapter and when it enters a cumulative mock.
What to do after finishing the chapter and how it connects to the next unit.
Note: for the official examinable syllabus of each school year, always confirm with the school, tutor, and current Ministry/IEP announcements.