打字猴:1.700993553e+09
1700993553
1700993554
1700993555
1700993556 8-30 直线,方程为斜率为
1700993557
1700993558
1700993559 8-31 
1700993560
1700993561
1700993562
1700993563
1700993564
1700993565 8-32 (1)时间单位,(2.1)时间单位;(2.2)时间单位.
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1700993567
1700993568
1700993569
1700993570 8-33 (1)l1=15c(m); (2)l2=24c(m); (3)l3=60c(m).
1700993571
1700993572 8-34 略.
1700993573
1700993574
1700993575 8-35 
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1700993577
1700993578 8-36 
1700993579
1700993580
1700993581 8-37 
1700993582
1700993583
1700993584 8-38 
1700993585
1700993586 8-39 19.7年.
1700993587
1700993588
1700993589 8-40 
1700993590
1700993591 8-41 n1=1,n2=n时,tanθr=(1-β2)sinθi/[(1+β2)cosθi-2β],β=v/c,
1700993592
1700993593
1700993594
1700993595
1700993596 8-42 (1)1.0×10-9N; (2)1.0×10-9N; (3)1.83×10-9s,1.50×10-9s.
1700993597
1700993598 8-43 1.24×10-10m.
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1700993600
1700993601 8-44 
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