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(II) The luminous efficiency of a lightbulb is the ratio of luminous flux to electric power input. (a) What is the luminous efficiency of a 100-W, 1700-lm bulb? (b) How many 40-W, 60-Im / W fluorescent lamps would be needed to provide an illuminance of 250 Im / m^2 on a factory floor of area 25 m× 30 m ? Assume the lights are 10 m above the floor and that half their flux reaches the floor.

(II) The luminous efficiency of a lightbulb is the ratio of luminous fl…

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(II) The luminous efficiency of a lightbulb is the ratio of luminous flux to electric power input. (a) What is the luminous efficiency of a 100-W, 1700-lm bulb? (b) How many 40-W, 60-Im / W fluorescent lamps would be needed to provide an illuminance of 250 Im / m^2 on a factory floor of area 25 m ×30 m ? Assume the lights are 10 m above the floor and that half their flux reaches the floor. | Numerade

(II) The luminous efficiency of a lightbulb is the ratio of luminous fl…

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