問題詳情
23. ( )光速為 3×公里∕秒，光走一年距離約為 9.46×公里，已知天狼星距地球約 8.光年，則光從天狼星傳播到地球所需的時間為多少年？
(A)
(B)
(C) 8.6×（9.46×1012）
(D) 8.6。
(A)
(B)
(C) 8.6×（9.46×1012）
(D) 8.6。
參考答案
答案：D
難度：困難0.2
統計：A(0),B(4),C(0),D(1),E(0)
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