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if the radius of the first Bohr's orbit ...

if the radius of the first Bohr's orbit of H-atom is x which of the following is/are the Correct conclusion :

A

The de-Broglie wavelength of electron in the third Bohr orbit of H-atom `=6pix`

B

The fourth Bohr's radius of `He^+` ion =8x

C

The de-Broglie wavelength of electron in third Bohr's orbit of `Li^"2+"=2pix`

D

The second Bohr's radius of `Be^(2+)=x`

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