Waves
Intensity-Amplitude Relation
Intensity proportional to amplitude squared.
Variables
IW/m²
Intensity
Wave intensity
In SI units: kg/s³
Am
Amplitude
Wave amplitude
Derivation
Energy ∝ A², power = energy/time ∝ A².
Your notes
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Other waves formulas with the same quantities
- Inverse Square Law (Intensity) (Wave Properties) shares Intensity
- SHM Displacement (Simple Harmonic Motion) shares Amplitude
- SHM Velocity (Simple Harmonic Motion) shares Amplitude
- SHM Maximum Velocity (Simple Harmonic Motion) shares Amplitude
- SHM Total Energy (Simple Harmonic Motion) shares Amplitude
- Sound Level (Decibels) (Sound Waves) shares Intensity
Where this formula is listed
- Waves formulas, under Wave Properties, alongside Wave Equation, Period and Frequency, Angular Frequency, Wave Number and Wave Speed on String.
- In the waves list it comes after Wave Intensity and before Inverse Square Law (Intensity).
- Waves formula sheet, one of 37 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
Common questions
What is the Intensity-Amplitude Relation formula?
Intensity-Amplitude Relation is written I ∝ A². Intensity proportional to amplitude squared. It belongs to Waves, under Wave Properties.
What are the units in I ∝ A²?
In SI units, I is intensity, measured in kg/s³; A is amplitude, measured in m.
How is the Intensity-Amplitude Relation formula derived?
Energy ∝ A², power = energy/time ∝ A². The result is I ∝ A².