MCQ
The ratio between Bohr radii is:
- A$1 : 2 : 3$
- B$2 : 4 : 6$
- ✓$1 : 4 : 9$
- D$1 : 3 : 5$
$1 : 4 : 9$, In Bohr’s atomic model, $r_n n^2$
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Assertion $A$ : $n - p - n$ transistor permits more current than a $p-n-p$ transistor
Reason $R$ : Electrons have greater mobility as a charge carrier
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