If ${\mathrm{\lambda }}_1\mathrm{and}{\mathrm{\lambda }}_2$are the wave length of characteristic X-rays and gamma rays respectively, then the relation between them is

• A

  ${\mathrm{\lambda }}_1=\frac{1}{{\mathrm{\lambda }}_2}$

• B

  ${\mathrm{\lambda }}_1={\mathrm{\lambda }}_2$

• C

  ${\mathrm{\lambda }}_1>{\mathrm{\lambda }}_2$

• D

  ${\mathrm{\lambda }}_1<{\mathrm{\lambda }}_2$