Question

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

Answer 1

P = 125664 lm ≈ 126000lm

Step-by-step 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