Wave Parameters, Types and Diffraction
Connect wave diagrams, measured parameters and energy transfer, then predict diffraction from wavelength and gap size.
How to study National 5 Physics
Move from a physical situation to a model, relationship, calculation and evidence-based conclusion, while using current official documents for exact assessment conditions.
Core concepts
Concept 1
Transverse oscillations are perpendicular to travel while longitudinal oscillations are parallel; both transfer energy.
Exam cue: Measure one complete cycle for wavelength or period.
Concept 2
Frequency, period, wavelength, amplitude and speed are linked through v = fλ and T = 1/f.
Exam cue: Convert number of waves and time to frequency before using v = fλ.
Concept 3
Diffraction occurs around objects or through gaps and is greater when wavelength is large relative to the gap.
Exam cue: Draw curved wavefronts emerging from a gap when diffraction is strong.
Risk pitfalls and guardrails
Measuring crest-to-trough as wavelength.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Confusing amplitude with peak-to-peak height.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Saying short wavelengths always diffract more.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Memory anchors
Transverse
Oscillation perpendicular to travel.
Longitudinal
Oscillation parallel to travel.
Wave speed
v = fλ.
Period
T = 1/f.
Frequency from count
Number of waves divided by time.
Strong diffraction
Wavelength comparable with or larger than the gap.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A cork oscillates as a ripple passes but has no overall journey with it. What does the ripple carry onward?
How are oscillation and energy-transfer directions arranged in a transverse wave?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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