1 Press ‘Ctrl-A’ © G Dear 2009 (Free to use. May not be sold) Year 12 - General.

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1 Press ‘Ctrl-A’ © G Dear 2009 (Free to use. May not be sold) Year 12 - General

2 9.4 Inverse Variation (1/2) illumination The illumination of a candle varies inversely with the square of the distance. A light bulb emits 80 candela/m 2 at 2 metres. L  Initial Conditions When L = 80, D = 2 k = 320 k = 80 x 2 2 1D21D2 L = kD2kD2 80 = k22k222 L = kD2kD2 What is the luminescence of the light bulb at 0.5 m? L = L = 1280 candela

3 9.4 Inverse Variation (2/2) illumination The illumination of a light bulb varies inversely with the square of the distance. A light bulb gives 80 candela/m 2 at 2 metres. L  Initial Conditions When L = 80, D = 2 k = 320 k = 80 x 2 2 1D21D2 L = kD2kD2 80 = k22k222 L = kD2kD2 What is the luminescence of the light bulb at 4 m? L = L = 20 candela