Q 1118834700.     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 `η` 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 sides faces of `A`. After the force is withdrawn, block `A ` executes small oscillations the time period of which is given by

A

`2sqrt(MηL)`

B

`2πsqrt(M/(Lη))`

C

`πsqrt(MηL)`

D

`3πsqrt(MηL)`

HINT

`η = (F//A)/(ΔL//L)`

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