Chapter 8 of 10
Concept Maps
Sound — Concept Maps
Tamil Nadu Board · Class 9 · Science
3 concept maps of Sound for Tamil Nadu Board Class 9 Science, each also written out as a text outline. Maps: Sound – Complete Chapter Overview and Sound.
43 questions40 flashcards5 concepts
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3 Concept Maps
Sound – Complete Chapter Overview
The map in words
- SOUND
- Production
- Vibration of objects
- Tuning fork activity
- Propagation
- Needs a medium
- Bell-Jar experiment
- Longitudinal wave
- Compressions
- Rarefactions
- Characteristics
- Amplitude
- Loudness
- Unit metre
- Frequency
- Pitch
- Unit Hz
- Time Period
- Reciprocal of frequency
- Wavelength
- Unit metre
- Speed
- v equals n lambda
- Amplitude
- Types by Frequency
- Infrasonic below 20 Hz
- Audible 20 to 20000 Hz
- Ultrasonic above 20000 Hz
- Speed of Sound
- Solids fastest
- Liquids medium
- Gases slowest
- Increases with temperature
- Air at 25C is 340 m/s
- Reflection of Sound
- Laws of reflection
- Echo
- Minimum 17 m
- 0.1 s gap needed
- Reverberation
- Auditorium problem
- Absorbed by fibreboard
- Applications
- Megaphone
- Stethoscope
- Ultrasound
- Above 20000 Hz
- Echolocation by bats
- Medical uses
- Echocardiography
- Kidney stone removal
- Echogram
- Industrial uses
- Cleaning
- Flaw detection
- SONAR
- Echo ranging
- Measures depth
- 2d equals v times t
- Human Ear
- Pinna
- Auditory canal
- Eardrum
- Hammer Anvil Stirrup
- Cochlea
- Auditory nerve
- Brain
- Production
Sound: Comprehensive Concept Overview
The map in words
- SOUND
- Production
- Vibrations
- Energy Form
- Sources
- Propagation
- Requires Medium
- Longitudinal Waves
- Compressions
- Rarefactions
- Characteristics
- Amplitude
- Frequency
- Wavelength
- Time Period
- Velocity
- Properties
- Loudness
- Amplitude Based
- Intensity
- Pitch
- Frequency Based
- Timbre
- Instrument Quality
- Loudness
- Behavior
- Reflection
- Echo
- Reverberation
- Speed Variation
- Applications
- Ultrasound
- SONAR
- Medical Imaging
- Cleaning Technology
- Echolocation
- Hearing
- Human Ear
- Frequency Range
- Infrasonic
- Ultrasonic
- Production
This flowchart shows the step-by-step process of how sound is produced when a tuning fork is struck and how it travels to the ear.
The map in words
- Strike Tuning Fork
- Fork Prongs Vibrate
- Push Air Molecules
- Nearby Molecules Vibrate
- Vibration Spreads Outward
- Sound Reaches Your Ear
- Brain Interprets as Sound
- Sound Reaches Your Ear
- Vibration Spreads Outward
- Nearby Molecules Vibrate
- Push Air Molecules
- Fork Prongs Vibrate
Explore these maps interactively
Explore DiagramsFrequently Asked Questions
What are the important topics in Sound for Tamil Nadu Board Class 9 Science?
Key topics in Sound include Production and Propagation of Sound, Characteristics of a Sound Wave, Distinguishing Sounds – Loudness, Pitch, and Timbre, Speed of Sound. Study these first, then practise questions on each for Class 9 exams.
What do the concept maps for Sound show?
The 3 maps show how the ideas in Sound connect: Sound – Complete Chapter Overview; Sound: Comprehensive Concept Overview. Each map is also written out as an outline on this page.
How should I revise Sound for Class 9 exams?
Learn the core ideas first, then work through the 43 practice questions on Sound. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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