Physics Practice Problems Energy Carried by Electromagnetic Waves Practice Problems Solution: You are trying to estimate the efficiency of a lig...

# Solution: You are trying to estimate the efficiency of a lightbulb by measuring the power of the light emitted vs the power consumed by the bulb. You have a circular detector with a radius of 12 cm and you measure an intensity of 1.7 kW/m2 from a distance of 1.5 m. If the lightbulb pulls 150 W of power from an outlet, what is the efficiency of the lightbulb?

###### Problem

You are trying to estimate the efficiency of a lightbulb by measuring the power of the light emitted vs the power consumed by the bulb. You have a circular detector with a radius of 12 cm and you measure an intensity of 1.7 kW/m2 from a distance of 1.5 m. If the lightbulb pulls 150 W of power from an outlet, what is the efficiency of the lightbulb?

Energy Carried by Electromagnetic Waves

Energy Carried by Electromagnetic Waves

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Energy Carried by Electromagnetic Waves

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Energy Carried by Electromagnetic Waves

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Energy Carried by Electromagnetic Waves

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Solved • Fri Feb 03 2017 14:06:08 GMT-0500 (EST)