Waves, Optics and Radioactivity
Apply wave models to reflection, refraction, sound and electromagnetic radiation and reason about nuclear decay and half-life.
How to prepare for the current ESAT
Confirm your course combination, build no-calculator fluency from Mathematics 1 upward, and use official Pearson materials for authentic timing and interface rehearsal.
Core concepts
Concept 1
Use amplitude, wavelength, frequency, period and wave speed for transverse and longitudinal waves.
Exam cue: State which wave quantity changes and which remains constant at a boundary.
Concept 2
Analyse reflection, refraction, optics, sound, Doppler effects and the electromagnetic spectrum.
Exam cue: Use a normal line when interpreting optical angles.
Concept 3
Distinguish alpha, beta and gamma properties, write nuclear changes and calculate half-life.
Exam cue: Track atomic number and mass number separately in decay.
Risk pitfalls and guardrails
Saying waves transport matter overall.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Measuring an angle from the surface rather than the normal.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Treating half-life as the time for all nuclei to decay.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Memory anchors
Wave speed
v = fλ.
Period
f = 1/T.
Refraction
Frequency stays fixed while speed and wavelength may change.
Sound
A longitudinal mechanical wave requiring a medium.
Alpha beta gamma
Different nature, charge, ionisation and penetration.
Half-life
Time for the undecayed number or activity to halve.
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
Wave speed equals?
Frequency 50 Hz, wavelength 0.40 m. Speed?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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