A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 4O A.I В. I/4 OC.I/2 D. I/16 O E. 21

A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 4O A.I В. I/4 OC.I/2 D. I/16 O E. 21

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 86P: Distances in space are often quoted in units of light years, the distance ugh travels in 1 year. (a)...

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Question

A point source emits light isotropically (i.e. with the same intensity in all
directions). Let I be the luminous intensity at a distance d from the source.
The intensity at a distance 2d is equal to:
40 A.I
О В. 1/4
OC.I/2
O D.I/16
O E. 21

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