某电磁波的频率为6×108Hz,此电磁波的波长为 m.光纤通信实际上是利用 在光导纤维里传播的. 答案:0.5;激光
【解析】
试题分析:(1)电磁波的波长、波速、频率之间的关系,即:c=λf(c是电磁波的波速,λ是电磁波的波长,f是电磁波的频率).
(2)所谓光纤通信,即是利用携带大量信息的激光在光导纤维中传递信息的.
【解析】
光在真空或空气中的传播速度约为3×108m/s.
故据c=λf知,λ===0.5m.
Shakespeare's play Hamlet ________ into at least ten different films over the past years.
[ ]
A.had been made
B.was made
C.has been made
D.would be made