A highly rigid cubical block A of mass M and side L is fixed rigidly on the another cubical block of same dimensions and of modulus of rigidity `rho` such that the lower face of A completely covers the upper face of B. The lower face of B is rigidly held on a horizontal surface. A small force F is applied perpendicular to one of the side faces of A. After the force is withdrawn, block A executes small oscillations, the time period of which is given by

Options

A. `2pisqrt(M eta L)`
B. `2pisqrt((Meta)/(L))`
C. `2pisqrt((ML)/(eta))`
D. `2pisqrt((M)/(etaL))`

Answer

D