Sound Waves Characteristics and Applications — Class 9 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 9 Science chapter "Sound Waves Characteristics and Applications" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Sound Waves Characteristics and Applications" — 8 important questions with detailed ans…
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Key Questions Covered:
- Define sound and explain how sound is produced and propagated.
- Define and explain pitch. How is pitch related to frequency?
- Define and explain loudness. What factors affect loudness?
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define sound and explain how sound is produced and propag… | ✓ Solved |
| Define and explain pitch. How is pitch related to frequency? | ✓ Solved |
| Define and explain loudness. What factors affect loudness? | ✓ Solved |
Showing 3 of 8 questions
Q1: Define sound and explain how sound is produced and propagated.
Sound = Mechanical wave produced by vibrating object; requires medium (air, water, solid) to propagate.
Production: Vibrating object causes surrounding medium particles to oscillate, creating disturbance.
Propagation: Disturbance travels through medium as longitudinal wave (particles oscillate paral...
Q2: Define and explain pitch. How is pitch related to frequency?
Pitch = Characteristic of sound that makes it "high" or "low" to listener.
Pitch depends on frequency (f) of vibrating source:
• Higher frequency → Higher pitch (shrill sound, like whistle)
• Lower frequency → Lower pitch (deep sound, like bass)
Frequency (f) = Number of vibratio...
Q3: Define and explain loudness. What factors affect loudness?
Loudness = Characteristic of sound that makes it "loud" or "soft" to listener; depends on intensity/amplitude.
Intensity (I) = Power per unit area = Energy per unit time per unit area (W/m²)
Amplitude (A) = Maximum displacement of particle from mean position
Factors affecting lou...
Showing 3 of 8 questions. Visit the full page for complete solutions.