A pendulum that beats seconds on the surface of the earth were taken to a depth of (1/4)th the radius of the earth. What will be its time period of oscillation?

A pendulum that beats seconds on the surface of the earth were taken t

1.	A pendulum that beats seconds on the surface of the earth were taken to a depth of (1/4)th the radius of the earth. What will be its time period of oscillation?
Answer» 5.107 sec 1.208 sec 3.401 sec 2.309 sec Answer :D