A.1.1×10-18
B.92.5
C.36.2
D.2.8×106
A.14907.61
B.41924.90
C.43481.32
D.69570.10
A.1.51
B.1.1
C.2.31
D.2.51
A.h2 = 1.1 m ,h3 = 1.5 m
B.h2 = 0.7 m ,h3 = 0.9 m
C.h2 = 0.7 m ,h3 =0.9 m
D.h2 = 1.3 m ,h3 = 1.5 m
在2cm3的空腔内存在着带宽为1×10-4μm,波长为5×10-1μm的自发辐射光。试问: