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The radius of first Bohr orbit of hydrog...

The radius of first Bohr orbit of hydrogen atom is `0.53Å`. Then the radius of first Bohr-orbit of mesnoic atom (negative meson has mass 207 times that of electron but same charge) is:

A

`2.85 xx 10^(-13)m`

B

`1.06 xx 10^(-13)m`

C

`0.53 xx 10^(-10)m`

D

`7.0 xx 10^(-12)m`

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