Question

Select One Option Correct from the following : A highly rigid cubical block A of small mass M and side L is fixed rigidly on to another cubical block B of the same dimensions and of low modulus of rigidity $\eta$ 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 A small force F is applied perpendicular to one of the side faces of A. After the force is withdrawn, block A executes small oscillations, the time period of which is given by
(A)$2\pi\sqrt{M \eta L}$
(B)$2 \pi\sqrt{\frac{M \eta }{L} }$
(C)$2 \pi\sqrt{\frac{M L }{\eta} }$
(D)$2 \pi\sqrt{\frac{M}{\eta L} }$

Answer 1

c option is correct I think

Answer 2

D is correct mark me brainlist