每公分衰減5%,剩下95%
0.95=e-(0.693/x) x=0.693/ln0.95=13.5
0.95=e^(0.693/x)ln0.95=0.693/xx=0.693/ln0.95x=13.51
44.X光射柱之強度在水中每公分被衰減了5%,則水對此X光射柱之半值層約為多少公..-阿摩線上測驗