Question

how many times stronger is an earthquake of magnitude 8.1 on the Richter scale, than an earthquake of magnitude 7.8?

Answer 1

its a log scale

Answer 2

so the question is really asking what is this factor
10^8.1/10^7.8

Answer 3

which is
10^(8.1-7.8)
=10^0.3

Answer 4

ratio of 8.1 to 7.8 Richter Scale here is just saying same unit of measurement
so 8.1/7.8 to 7.8/7.8
1.03 : 1
so 1.03 times stronger