Sound — Class 11 Maharashtra HSC Physics revision notes
A 5-page visual revision sheet for Sound, written for Class 11 Maharashtra HSC Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
What this Sound sheet covers
- Waves, and what makes one progressive
- Transverse vs longitudinal
- Transverse
- Longitudinal
- Wave speed, the basics
- speed, frequency and wavelength
- frequency is the reciprocal of period
- The progressive wave equation
- displacement of a particle at position x, time t
- angular frequency, angular wave number
- Speed of a transverse wave on a string
- tension T, mass per unit length m
- Newton's formula and Laplace's correction
- Newton, isothermal elasticity
- Laplace, adiabatic elasticity
- for air
- Speed of sound in air at NTP, Laplace's formula
- Factors affecting the speed of sound in air
- Superposition of waves
- Echo, reverberation and acoustics
- Minimum distance for a distinct echo
- sound must travel there and back in more than 0.1 s
- Timing an echo off a wall
- Sound reflection at work
- Bats
- Dolphins
- SONAR
- Medical ultrasound
- Qualities of sound
- The decibel scale
- loudness in bel
- loudness in decibel, the common unit
- threshold of hearing
- The Doppler effect
- Doppler formula, general form
- listener speed v_L, source speed v_s, sound speed v
- A siren approaching a stationary listener
- Symbols
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Sound the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.