第12章: 一绝对黑体在温度 T 1 = 1450K时,辐射峰值所对应的波长为 l 1 ,当温度降为725K时,辐射峰值所对应的波长为 l 2 ,则 l 1 / l 2 为:
A.
B.
C.
2
D.
1/2
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