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Path to 300

Physics / Topic coverage

Waves/SHM/Sound

SHM energy/phase + wave equation & Doppler/beats — spikes in some years (e.g. 2024).

Weight mediumIntensity Core · weeklyTrend Rising300-target 10 /100medium
Path to 300

Mark budget for this portion

Full 300 plan →
At ~10.2% of physics weight, this portion should reliably deliver ~10 of your 100 physics marks — treat misses here as rank-droppers.
7.5Floor marks
10Target marks
11.5Stretch marks
10.2%Of subject weight
100Subject target
At a glance

Coverage metrics

24Tagged questions
10.2%Of Physics
3.43Average / year
2024Peak year (8 Q)
7/7Years present
Official · 2026

Syllabus map for this portion

Full Physics syllabus →
Wave motion and sound from official Mechanics; SHM also appears in Mechanics core.

Must cover from syllabus

  • Standing waves on strings/air columns
  • Beats; Doppler in sound
  • Superposition of plane waves

Gaps / exclusions to watch

  • Resonance column experiment linkage
Unit 01

Mechanics — Waves and Sound

medium

Exam focusStanding waves on strings/air columns; beats; Doppler in sound.

Syllabus points

  • Plane waves; longitudinal/transverse; superposition
  • Progressive and stationary waves; strings and air columns; resonance; beats
  • Speed of sound in gases; Doppler effect (sound)

Do / check

  • Draw nodes/antinodes for boundary conditions
  • State observer/source motion clearly for Doppler
Unit 02

General (Units, Errors, Experiments)

medium

Exam focusDimensional analysis, significant figures, experiment setups named in syllabus.

Syllabus points

  • Units and dimensions; dimensional analysis; least count; significant figures
  • Error analysis for listed experiments: Vernier, screw gauge, g by pendulum, Young’s modulus, surface tension by capillary, calorimeter specific heat, u–v focal length, resonance column, Ohm’s law, meter bridge / post office box

Do / check

  • Write least count and % error formula before computing
  • Know what each named experiment measures
2020–2026

Year-wise appearance

Counts of tagged questions for this topic each year.

203
211
221
235
248
254
262

Reading the pattern

  • Waves/SHM/Sound accounts for ~10.2% of tagged physics questions (2020–2026).
  • Trend signal: rising (early-window avg 1.7/yr vs recent avg 4.7/yr).
  • Appears in 7/7 tagged years; peak 2024 (8 Q), low 2021 (1 Q).
  • Dominant subtopics: Waves/Sound (13), SHM (11).
  • Question-type mix: Numerical 41.7%, Matching 25.0%, Single correct 16.7%, Multi correct 16.7%.
Internal breakdown

Subtopic coverage

Start with the top subtopics — they usually carry most of this portion’s weight.

  • Waves/Sound13 · 54.2%
  • SHM11 · 45.8%
SubtopicCountShareYears (count)
Waves/Sound1354.2%2020·3 2021·1 2023·3 2024·3 2025·2 2026·1
SHM1145.8%2022·1 2023·2 2024·5 2025·2 2026·1
Exam form

Type & difficulty mix

Question types

  • Numerical — 10 questions (41.7%)
  • Matching — 6 questions (25%)
  • Single correct — 4 questions (16.7%)
  • Multi correct — 4 questions (16.7%)

Difficulty (heuristic)

  • H — 17 questions
  • M — 7 questions

Use for planning load only — not an official difficulty label.

Focused study

Plan for this portion

Must know

  • x=A sin(ωt+φ) bookkeeping
  • Wave on string / speed / harmonics
  • Beats & Doppler relative velocity signs

Common traps

  • Phase vs path confusion
  • Wrong Doppler case formula

Weekly drill checklist

  • 2 SHM
  • 2 waves/sound
  • 1 join with mechanics

Prerequisite chain

Oscillations→SHM→waves→sound

Often joins with

MechanicsOptics
Paper pointers

Sample tagged questions

Use these as deliberate practice targets from past papers.

YearPaperQSubtopicTypeDiff
2020P1Q5Waves/SoundSCM
2020P1Q17Waves/SoundNUMH
2020P2Q11Waves/SoundMCH
2021P2Q2Waves/SoundMCH
2022P2Q7SHMNUMM
2023P1Q13SHMNUMH
Connections

Related mixed joins

Where this topic must connect with another concept in one stem.

Physics2024 · Paper 1 · Q6–Q7multi-correct

Waves multi-correct + ray optics multi-correct

Waves / Sound+Ray optics+Multi-correct option logic

Knowledge bridge

Step 1: for waves, check superposition/phase options individually. Step 2: for optics, ray-trace each claim (TIR, magnification, mirror/lens sign). Step 3: never assume ‘exactly two correct’ — mark only proven options.

Why it feels hard

Two consecutive MC items amplify partial-marking risk.

What to practise

Practise MC pairs under a strict ‘prove or leave’ rule.

Open 2024 year review →
Physics

Other portions

MechanicsOpticsThermodynamics/Kinetic TheoryElectrostaticsMagnetism/EMI/ACModern PhysicsCurrent ElectricityFluid/Properties of Matter
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