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30 October, 03:46

A spotlight shines on an area 20.0 m away with an illumination of 25.0 Ix.

What is the luminous flux emitted by the spotlight? *

Answers

- 15,400 lm

- 6,280 lm

- 126,000 lm

- 102,000 Im

Answers (1)
  1. 30 October, 03:56
    0
    P = 125664 lm ≈ 126000lm

    Explanation:

    The light intensity is the power of the beam in the area of the beam,

    I = P / A

    the area of a sphere is

    A = 4π r²

    P = I A

    P = 25.0 4π 20²

    P = 125664 lm ≈ 126000lm
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