At what distance does a 100-W lightbulb producethe same intensity of light as a 75-W lightbulb produces10 m away? (Assume both have the same efficiency forconverting electrical energy in the circuit into emittedelectromagnetic energy.)

At what distance does a 100-W lightbulb producethe same intensity of light as a 75-W lightbulb produces10 m away? (Assume both have the same efficiency forconverting electrical energy in the circuit into emittedelectromagnetic energy.)

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 53P: At what distance does a 100-W lightbulb produce the same intensity of light as a 75-W lightbulb...

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Question

At what distance does a 100-W lightbulb produce
the same intensity of light as a 75-W lightbulb produces
10 m away? (Assume both have the same efficiency for
converting electrical energy in the circuit into emitted
electromagnetic energy.)

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