Math-指數定律(F.3)

Put 0.0000488 = 510^y
ylog510 = log0.0000488
y= log0.0000488/log510 = -4.31158/2.70757= -1.5924.
That is 0.0000488= 510^(-1.5924) is less than 510^(-x).
Therefore, x is less than 1.5924.