Q1
What is an echo?
AReflection of sound
BAbsorption of sound
CRefraction of sound
DCreation of sound
ICSEClass 10 (ICSE)PhysicsCh 7 · Topic 1
Sound
Sound waves have properties like reflection (echo), and concepts like resonance and reverberation are important for understanding acoustics.
Core concept
An echo is the reflection of sound, requiring a minimum distance of about 17m from a reflecting surface, so the sound is heard as a distinct repetition.
How it works
Reverberation is the persistence of sound due to repeated reflections, useful in halls but needs control to avoid confusing overlapping sounds.
Why it matters
Resonance occurs when an object vibrates at its natural frequency due to being driven by a sound of matching frequency, amplifying the sound.
Key detail
Understanding sound properties helps in designing auditoriums, musical instruments, and various sound-related technologies like sonar.
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Quick notes
• An echo is reflected sound.
• Requires minimum ~17m distance from a surface.
• Reverberation: persistence via repeated reflections.
• It's useful in halls but needs control.
• Resonance: vibration at natural frequency, matching frequency source.
• This amplifies the sound.
• These concepts aid auditorium design.
• They're also used in sonar technology.