briannaalfonzoo
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Use a variation model to solve for the unknown value.

The intensity of light from a light source varies inversely as the square of the distance from the source. If the intensity of a light bulb is 400 lumen/m²(lux) at a
distance of 7 m, determine the intensity at 10 m

Round your answer to the nearest hundredth, if possible

The intensity is (BLANK)
lux when the distance is 10 m

Respuesta :

Answer:

Step-by-step explanation:

Let L₀ be the luminosity as measured 1 m from the source

400 = L₀/7²

L₀ = 400(49) = 19,600 lumen

L = 19600 / 10²

L = 196 Lumen