Question

how to use log for physics

Answer 1

log is like the inverse method used to find the power of an exponent

[math]2^{3}=8[/math] we know this equation
but imagine we didn't know it and we were posed with this:
[math]2^{x}=8[/math]
Then how do we find x?
In comes logarithms
2 is the base and x is the exponent. So rewrite [math]2^{x}=8[/math] as 
[math]\log _{2}8=x[/math] which will give us 3 as the answer
So [math]\log _{2}8=x=3[/math]

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