Which of the following statement is incorrect?

Options

A. The e/m ratio for anode rays is not constant.
B. The e/m ratio for anode rays is considerably smaller than elecrons.
C. Millikan oil drop experiment showed particle nature while diffraction studies showed wave nature of electron.
D. the wavelength associated with an electron would become equal of the weavelength associated with a proton when velocity of proton is about 1836 times that of electron.

Answer

D

Explanation

`lamda_((e))=h/(m_(e)v_(e)),lamda_((p))=h/(m_(p)v_(p))`
`m_(p)=1836m_(e)` and `lamda_((e))=lamda_((p))`
`:.h/(m_(e)v_(e))=h/(1836m_(e)v_(p))` or `(v_(p))/(v_(e))=1/1836`
or `v_(p)=1/1836`of `v_(e)`