kelsiec09 kelsiec09

09-03-2020
Mathematics

contestada

The intensity I of light from a light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is 250 250 w/m squared 2 when the distance is 3 3 m. How much farther would it be to a point where the intensity is 40 40 w/m squared 2? It would be nothing meters farther.

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lucastpitera lucastpitera

09-03-2020

i need this also so if anyone has it please help

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amna04352 amna04352

09-03-2020

Answer:

4.5 m

Step-by-step explanation:

I = k/d²

k = I × d²

250 × 3² = 40 × d²

d = 7.5 m

7.5 - 3 = 4.5m

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