Question

what is the richter scale? why do we say that it is not a linear scale

Answer 1

richter scale is a scale on which we measure the intensity of earthquakes

it is not a linear scale because when we increase it linearly then it means that the intensity of earthquake will increase 10 times

Answer 2

This is because the next value on the scale after the previous value does not increase in a linear order - like 1,2,3,4.. or 5,10, 15, 20. In the richter scale the magnitude of next value is 10 times the previous value, like 1, 10, 100, 1000...