本题目来源于试卷: 美国2021年物理杯赛真题 PHYSICS BOWL 2021，类别为 美国物理杯赛(Physics Bowl)
[单选题]
Two separate simple pendulums are swinging back and forth. It is found that pendulum A has twicethe frequency of pendulum B. Which statement could account for this difference?
A. Pendulum B is twice as long as pendulum A.
B. Pendulum B was released before pendulum A.
C. Pendulum B is twice as massive as pendulum A.
D. The length of pendulum B is four times the length of pendulum A.
E. The mass of pendulum B is four times the mass of pendulum A.
参考答案: D
本题详细解析:
$T=2π \sqrt{\frac{L}{g}}$; $f=\frac{1}{T}$
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