The mass and diameter of a planet are twice those of earth. The period of oscillation of pendulum on this planet will be

Q: The mass and diameter of a planet are twice those of earth. The period of oscillation of pendulum on this planet will be (if it is a second’s pendulum on earth)

(a) 1/√2 s

(b) 2√2 s

(c) 2 s

(d) 1/2 s

Ans: (b)