题目内容：

还是SAT2物理题（有关光学的）
which of the following types of electromagnetic radiation has the longest wavelength?
A.Gamma rays
B.Ultraviolet
C.Blue light
D.X-rays
E.Orange light
另外求一下各种光的波长表格多谢~
最好能讲一下具体几种光的波长,.答案我知道不要说答案了,