The circumference of circular orbit of electron in a \( \mathrm{He}^{+} \)ion is five times the ...

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The circumference of circular orbit of electron in a \( \mathrm{He}^{+} \)ion is five times the de-Broglie wavelength associated with the electron. Find the radius of the orbit.
(a) \( 6.613 \AA \)
(b) \( 2.824 \AA \)
(c) \( 5.623 \AA \)
(d) \( 4.628 \AA \)
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