Intensity-amplitude
Intensity of a wave is proportional to?
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About This Question
- Subject
- physics
- Chapter
- oscillations and waves
- Topic
- intensity-amplitude
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Square of amplitude
- Definition of Intensity: Average power transmitted per unit area perpendicular to the direction of wave propagation.
- Energy Link: Energy density u of a mechanical wave is given by u=21ρ(ωA)2. Since ω is constant for a given frequency, u∝A2.
- Intensity Calculation: I=(Energy Density)×(Wave Velocity).
- Result: Both energy and intensity are directly proportional to the square of the amplitude (I∝A2).
- Impact: Doubling the amplitude increases the intensity by a factor of 4.
This medium difficulty physics question is from the chapter oscillations and waves, covering the topic of intensity-amplitude. It appeared in the 2025 exam.
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