Intensity of a Light Bulb The farther a person is from a light bulb, the less intense its light is. The equation I = 19 / 4d^2 approximates the intensity of light from a 60-watt light bulb at a distance of d meters, where I is measured in watts per square meter.
(a) Find I for D = 2 meters and interpret the result.
(b) The intensity of light from a 100-watt light bulb is about I = 32 / 4d^2. Find an expression for the sum of the intensities of light from a 100-watt bulb and a 60-watt bulb.© BrainMass Inc. brainmass.com March 4, 2021, 11:00 pm ad1c9bdddf
From the condition, we have I = 19 / 4d^2.
(a) When d = 2, we have I = 19 / (4 * 2^2) = 19 / 16 = 1.1875
It means that the intensity of the 60-watt light bulb is 1.1875 watts per square meter ...
Find an expression for the sum of the intensities of light from a 100-watt bulb and a 60-watt bulb.