A.3P1 B.4P1 C.5P1 D.6P1
A.波長變短,光速變慢 B.波長不變,頻率變大 C.頻率不變,光速不變 D.波長不變,頻率不變
A.4.5mm B.0.9mm C.3.1mm D.1.2mm