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23 人眼之瞳孔直徑約為 4 mm,可見光波長平均約為 500 nm。今欲設計一無線電望遠鏡以接收波長為20 cm 的電磁波,使其恰可被人眼所鑑別,則其直徑要多大才能達到這個目的?(A)800 m 1
問題詳情
23 人眼之瞳孔直徑約為 4 mm,可見光波長平均約為 500 nm。今欲設計一無線電望遠鏡以接收波長為20 cm 的電磁波,使其恰可被人眼所鑑別,則其直徑要多大才能達到這個目的?
(A)800 m 160
(B) 0 m 240
(C) 0 m 300
(D) 0 m
參考答案
答案:C
難度:困難0.255319
統計:A(13),B(19),C(12),D(3),E(0)
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