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Analyzing Sound Waves
Waveform analysis shows amplitude, frequency, period and shape.
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Analyzing Sound Waves
Recommended for Class 10
Analyzing Sound Waves
Sound waves can be analyzed using graphs and electronic instruments.
A microphone converts sound vibration into an electrical signal.
This signal can be displayed as a waveform.
Amplitude
Greater waveform amplitude generally represents greater sound intensity.
Frequency
Frequency can be determined by counting cycles per second or measuring the period.
**f = 1T**
Period
The period is the time for one complete cycle.
Waveform Shape
Different sound sources can have different waveform shapes because of their different harmonic content.
This contributes to differences in timbre.
Oscilloscope
An oscilloscope or digital waveform display allows us to observe:
amplitude; period; * waveform shape.
Worked Example
If one cycle takes:
T = 0.002 s
then:
**f = 1T**
= 10.002
= **500 Hz**
Analyzing Sound Waves — Advanced
Common Mistakes
Common Mistakes
- Mistake
Amplitude is not frequency.
- Mistake
Large amplitude does not automatically mean high pitch.
- Mistake
Shorter period means higher frequency.
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Practice
PQ
Q1. Define period.
PQ
Q2. Define frequency.
PQ
Q3. Calculate f from T.
PQ
Q4. Explain amplitude on waveform.
PQ
Q5. Explain waveform shape and timbre.
Exam Practice
EQ
Q1. Explain how a microphone helps analyze sound.
EQ
Q2. Define period and frequency.
EQ
Q3. Use f=1T.
EQ
Q4. Explain amplitude vs pitch.
EQ
Q5. Explain waveform and timbre.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.