Find the value of logarithm given below :

${\log }_2 8$

Find the value of ${\log }_3 81$.

Find the value of ${\log }_{10} 0.1$.

Find the value of  logarithm given below :

${\log }_{10} 0.01$

Find the value of logarithm given below:

${\log }_{10}0·0001$

Find the value of  logarithm given below:

Find the value of logarithm given below:

 ${\log }_{3}1/27$

Find the value of logarithm given below:

${\log }_{3}1$

Find the value of logarithm given below:

${\log }_{1/2}1/4$