The intensity of light, LLL, from a source is inversely proportional to the square of the distance, d d\,d m, from the source.
L L\,L is given by the formula: L=200d2\displaystyle L = \frac{200}{d^2}L=d2200
Find the light intensity when the distance is 5 m.
Practise Edexcel GCSE Maths Direct and Inverse Proportion with exam-style questions for Foundation and Higher tier. 96 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.