Teaching PSTET Paper 1 & 2 Mock Test 2024 Quantitative Aptitude Ratio and Proportion Direct or Indirect Proportion
The intensity of light varies inversely as the square of the distance from the source. If the intensity is 25 units at a distance of 4 meters, what is the intensity at a distance of 8 meters?
1
6.25 units
2
12.5 units
3
9 units
4
4 units