In the radioactive decay of ${\mathrm{}}_{\mathrm{Z}}{\mathrm{X}}^{\mathrm{A}}$ , which of the following could be considered as incorrect statement?

Electrons in a cathode ray tube have been emitted with a velocity of $1000 {\mathrm{ms}}^{-1}$. The number of following statements which is/are true about the emitted radiation is

Given : $\mathrm{h}=6\times {10}^{-34}\mathrm{Js},{\mathrm{m}}_{\mathrm{e}}=9\times {10}^{-31} \mathrm{kg}$

(A ) The deBroglie wavelength of the electron emitted is $666.67 \mathrm{nm}$

(B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.

(C) The cathode rays start from cathode and move towards anode.

(D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..