MCQ
unknown $(A)$ is


- A

- B

- ✓

- D







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(Where $a _{0}=$ Bohr radius $52.9 pm$ ) is $km s ^{-1}$
(Given : Mass of electron $=9.1 \times 10^{-31} kg$, Planck's constant $h =6.63 \times 10^{-34} \;Js$ )
