A) \[{{R}_{e}}\]
B) \[-2mg{{R}_{e}}\]
C) \[2mg{{R}_{e}}\]
D) \[1\frac{1}{2}mg{{R}_{e}}\]
Correct Answer: D
Solution :
According to Bohr, velocity of electron in a orbit is \[{{R}_{e}}\] For 1st orbit \[-2mg{{R}_{e}}\]then \[2mg{{R}_{e}}\]
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