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In order to have the same wavelength for...

In order to have the same wavelength for the electron (mass `m_(e)`) and the neutron (mass `m_(n)`) their velocities should be in the ratio (electron veloctiy/neutron veloctity) :-

A

`m_(n)//m_(e)`

B

`m_(n)xxm_(e)`

C

`m_(e)//m_(n)`

D

one

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