Physics: The illuminance on a surface is six lux and the surface is 4 meters from the light source what is the intensity of the source

The illuminance on a surface is six lux and the

Ответ:

Xlhoncho45

10.03.2022

Answer : 96 candelas

Explanation : Luminous intensity is a quantity of light that is emitted by a light source with a solid angle in a particular direction.

We know the formula of luminous intensity

Luminous intensity = illuminance x distance from light source

$L_{v} = E_{v}\times d^{2}$

$L_{v} = 6\times 16\ candelas$

$L_{v} = 96\ candelas$

So, the intensity of the source will be 96 candelas.

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Ответ:

sfigel3160

08.12.2020

Physics

$W=3.36\times 10^{-11}\ J$

Explanation:

Given

Electric Potential difference is $\Delta V=2.1\times 10^8\ V$

Charge of Electron $q=1.6\times 10^{-19}\ C$

Change in Electric Potential Energy when electron moves from the ground to the cloud require certain amount of work to move electron against a potential from Ground to cloud

Change in electric Potential Energy $=q\times \Delta V$

$W=1.6\times 10^{-19}\times 2.1\times 10^8$

$W=3.36\times 10^{-11}\ J$

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The illuminance on a surface is six lux and the surface is 4 meters from the light source what is the intensity of the source

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