e) Intensity

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Last updated 11:06 PM on 3/4/26
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4 Terms

1
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  • define intensity


  • power transferred by a wave onto a surface per its unit area


2
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  • state the formula for intensity


  • I = P/A

    • intensity of a wave (Wm-2) = power transferred by the wave (W) / area of the surface (m2)


3
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  • state the formula for intensity if the wave originates from a point source


  • I = P/4πr2

    • intensity of a wave (Wm-2) = power transferred by the wave (W) / (4 × π × distance from the surface to the source2 (m2) )


4
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  • state the relationship between the intensity and amplitude of a wave


  • intensity ∝ amplitude2