1 Answer

Nickolas Hook · Answer 1 · 2021-11-25T15:52:03+0000

Using the concepto of Irradiance which is the radiant flux (power) received by a surface per unit area we have that,

I = (P)/(A)

Here,

P = Power

A = Area

The propagation of the irradiance is carried out in an area proportional to that of a sphere we will then have,

$I = (P)/(4\pi r^2)$

Irradiance at a distance of 1m from the source of light is

$I = (1W)/(4\pi (1)^2)$

I = 0.0796W/m^2

I = 0.08W/m^2

Irradiance at a distance of 2m from the source of light is

$I = (1W)/(4\pi 2^2)$

I = 0.0198W/m^2

I = 0.02W/m^2

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