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Be^(3+) and a proton are accelerated by...

`Be^(3+)` and a proton are accelerated by the same potential, their de`-` Broglie wavelengths have the ratio ( assume mass of proton `=` mass of neutron `) :`

A

`1:2`

B

`1:4`

C

`1:sqrt21`

D

`1:3sqrt3`

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