(19)桂花(A)硬木插 (B)軟枝插(C)葉插法 (D)鱗片插 (E)根插法

1. A child of mass M is swinging on a swing of length L to a maximum deflection angle of θ. A man of mass 4M is swinging on a similar swing of length L to a maximum angle of 2θ. Each swing can be treated as a simple pendulum undergoing simple harmonic oscillation. If the period for the child's motion is T, then the period for the man's motion is (A) T (B) 2T (C) T/2 (D) T/4.