Question

What is the length of a seconds pendulum?

(a) 1m

(b) 2m

(c) 9.8m

(d) 0.5m

Answer 1

Correct option is (a) 1m

For explanation I would say: Time period of seconds pendulum = 2s.                                                                                                      ∴ 2 = 2π √(L/9.8)                                                                                                                                                                        OR L = 1m.