If ${\lambda _1}$ and ${\lambda _2}$ are the wavelengths of characteristic $X$-rays and gamma rays respectively,then the relation between them is
- A${\lambda _1} = \frac{1}{{{\lambda _2}}}$
- B${\lambda _1} = {\lambda _2}$
- C${\lambda _1} > {\lambda _2}$
- D${\lambda _1} < {\lambda _2}$
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