Sound
ICSE · Class 10 · Physics
Quick revision notes for Sound — ICSE Class 10 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Sound Waves and Their Properties
- Sound waves are longitudinal mechanical waves that require a medium for propagation
- Human audible range: 20 Hz to 20,000 Hz
- Ultrasonic waves: frequency > 20,000 Hz
Reflection of Sound and Echo
- Sound waves follow laws of reflection when hitting rigid surfaces
- Echo is heard when reflected sound reaches ear after original sound ceases
- Minimum distance for echo = 17 m (in air)
Types of Vibrations
- Free vibrations: constant amplitude, no external force, frequency = natural frequency
- Damped vibrations: decreasing amplitude due to resistive forces
- Forced vibrations: external periodic force applied, frequency = applied frequency
Resonance
- Special case of forced vibrations when applied frequency = natural frequency
- Results in maximum amplitude of vibration
- Can be demonstrated with pendulums of same length
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What are the important topics in Sound for ICSE Class 10 Physics?
Sound covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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