Sound Waves: Characteristics and Applications-Characteristics of Sound Waves Science Exploration Class 9 In English-CBSE Notes
Explore NCERT Solutions for Class 9 science exploration Chapter Sound Waves: Characteristics and Applications Topic Characteristics of Sound Waves with simple explanations and free ncert solution in English.
Class 9 Science Exploration Exploration Chapter 10 Sound Waves: Characteristics and Applications Characteristics of Sound Waves
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All Topics Chapter Sound Waves: Characteristics and Applications
- 1. Chapter Review and Key Points
- 2. Production of Sound
- 3. Sound as a Longitudinal Wave
- 4. Characteristics of Sound Waves
- 5. Speed of Sound
- 6. Reflection of Sound
- 7. Ultrasonic Sound
- 8. Assignments - What Have You Learned?
Notes
Sound Waves: Characteristics and Applications-Characteristics of Sound Waves Science Exploration Class 9 In English-CBSE Notes
Sound Waves: Characteristics and Applications
Characteristics of Sound Waves
Chapter 10. Sound Waves: Characteristics and Applications
This section explains the important characteristics of sound waves, including wavelength, frequency, time period, amplitude and speed. These quantities help describe the behaviour of sound and explain properties such as loudness and pitch.
Characteristics of Sound Waves
Every sound wave possesses certain measurable properties that help describe its behaviour during propagation.
Wavelength (λ)
Wavelength is the distance travelled by a sound wave during one complete vibration.
Definition
The distance between the centres of two consecutive compressions or two consecutive rarefactions is called the wavelength (λ).
- Symbol – λ (Lambda)
- SI Unit – metre (m)
- Measurement – Distance between two successive compressions or rarefactions.
Frequency (ν)
Frequency tells us how many complete vibrations are produced in one second.
Definition
The number of vibrations or oscillations completed in one second is called the frequency.
- Symbol – ν (Nu) or f
- SI Unit – hertz (Hz)
- Higher Frequency – Produces a higher-pitched sound.
- Lower Frequency – Produces a lower-pitched sound.
Time Period (T)
The time period represents the time required to complete one vibration.
Definition
The time period (T) is the time taken by a vibrating particle to complete one oscillation.
- SI Unit – second (s)
- Relation – Frequency and time period are inversely proportional.
Formula: T = 1 / ν
Amplitude (A)
Amplitude is the maximum displacement of a vibrating particle from its mean position.
Definition
The maximum displacement of a vibrating particle on either side of its mean position is called the amplitude.
- Greater Amplitude – Produces louder sound.
- Smaller Amplitude – Produces softer sound.
Loudness
Loudness is the sensation produced in the ear due to sound. It mainly depends on the amplitude of vibration.
- Greater amplitude produces greater loudness.
- Measured in decibel (dB).
- Depends on the intensity of sound reaching the ear.
Pitch
Pitch is the characteristic that enables us to distinguish between high and low sounds.
- Depends on the frequency of vibration.
- Higher frequency produces higher pitch.
- Lower frequency produces lower pitch.
Speed of Sound
The speed of sound is the distance travelled by a sound wave in one second.
Formula
Speed = Frequency × Wavelength
v = νλ
Relationship Among Wave Quantities
| Quantity | Symbol | SI Unit |
|---|---|---|
| Wavelength | λ | metre (m) |
| Frequency | ν or f | hertz (Hz) |
| Time Period | T | second (s) |
| Amplitude | A | metre (m) |
| Speed | v | m/s |
Solved Example
Question: A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. Calculate its speed.
Solution:
Given:
- Frequency (ν) = 500 Hz
- Wavelength (λ) = 0.68 m
Using the formula:
v = νλ
v = 500 × 0.68 = 340 m/s
Answer: The speed of sound is 340 m/s.
ATP Education Concept Builder
Remember the three important relationships: Amplitude controls loudness, Frequency controls pitch, and Speed depends on both frequency and wavelength. Students often confuse loudness with pitch, but they depend on different wave characteristics.
ATP Education Exam Booster
- Learn the definitions of wavelength, frequency, time period and amplitude.
- Memorise the formulas T = 1/ν and v = νλ.
- Remember that loudness depends on amplitude, while pitch depends on frequency.
- Practise numerical problems based on the speed of sound.
- CBSE competency-based questions frequently ask students to identify which wave characteristic changes the loudness or pitch of sound.
All Topics Chapter Sound Waves: Characteristics and Applications
Sound Waves: Characteristics and Applications-Characteristics of Sound Waves Science Exploration Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 science exploration Chapter Sound Waves: Characteristics and Applications – Characteristics of Sound Waves
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