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When the distance between a point source of light and a light meter is reduced from 6.0m to 2.0...

Question:

When the distance between a point source of light and a light meter is reduced from 6.0m to 2.0 m, the intensity of illumination at the meter will be the original value multiplied by _____.

Intensity of Light:

In physics, the light intensity decreases when the distance increases because they are positively related to each other. It defines as the brightness of the light which comes from a source like a torch, flashlight or lamp.

Answer and Explanation: 1

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Given data:

  • The initial distance is: {eq}{x_1} = 2\;{\rm{m}} {/eq}
  • The initial distance is: {eq}{x_2} = 6\;{\rm{m}} {/eq}


Recall the expression...

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Intensity in Physics: Definition & Measurement

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Chapter 5 / Lesson 10
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This lesson explains what wave intensity in physics is, and it explains the intensity of light formula with examples. This lesson also describes how to calculate intensity of sound waves.


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