A spherical body, of mass m and radius r, is allowed to fall in a medium of viscosity 
. The time in which the velocity of the body increases from 0 to 0. 63 times the terminal velocity ( 
) is called time constant ( 
) . Dimensionally 
can be represented as
A
B
C
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
D
Time constant is the time of free fall of a body under gravity in the viscous medium, during which the velocity of the body increases to 63% of the terminal velocity. Dimensionally, none of the alternatives have dimensions of time.
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