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10 cards from this deck
Energy per second through each unit of surface area
watts per square metre (W m−2\text{W m}^{-2}W m−2)
Total energy emitted per second by the source
Intensity inversely proportional to square of distance (I∝1r2I \propto \frac{1}{r^2}I∝r21)
Intensity becomes one-quarter of original value
Intensity becomes one-ninth of original value
I1r12=I2r22I_1 r_1^2 = I_2 r_2^2I1r12=I2r22
Intensity is proportional to source strength (I∝SI \propto SI∝S)
A=4πr2A = 4\pi r^2A=4πr2
Gravity, electrostatic forces, sound, X-rays, gamma rays
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