In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

In a vibrating system, if the actual damping coefficient is 40 N/m/s a

1.	In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
A.	0.2
B.	0.4
C.	0.6
D.	0.8
Answer» D. 0.8