Question

the separation between a point source of light and a screen is increased by 1.5 %. the percentage change in the intensity is. 1. increases by 3%. 2. decreases by 3% 3. increases by 0.75%. 4. increases by 7.5 %​

Answer 1

The the percentage change in the intensity is option 2. decreases by 3%

Explanation :

We know that the intensity of light is inversely proportional to the square of distance.

I ∝ 1/d²

=> I₂/I₁ = (d₁/d₂)²

let d₁ = 100

=> d₂ = 101.5

=> I₂/I₁ = (100/101.5)² = 0.97

=> I₂ = 0.97 I₁

hence the percentage change can be given as

=> (I₂ - I₁)/I₁ = -0.03 = -3%

Hence the the percentage change in the intensity is option 2. decreases by 3%

Answer 2

Explanation:

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