Trả lời:

Theo đề bài ta có:

$r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$ $r_{n} + r_{n + 7} = r_{n + 8}$

$\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$ $\Leftrightarrow n^{2} r_{0} + {(n + 7)}^{2} r_{0} = {(n + 8)}^{2} r_{0}$

$\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$ $\Leftrightarrow n^{2} + {(n + 7)}^{2} = {(n + 8)}^{2}$

$\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$ $\Leftrightarrow n^{2} - 2 n - 15 = 0$

$\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$ $\Rightarrow [\begin{matrix} n = 5 \\ n = - 3 (l o a i) \end{matrix}$

Khi đó lực tương tác giữa electron và hạt nhân trong nguyên tử hidro ở quỹ đạo dừng n là :

$F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$ $F = \frac{k e^{2}}{r^{2}}$

$F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$ $F = \frac{{9.10}^{9} . {(1, {6.10}^{- 19})}^{2}}{{(25.5, {3.10}^{- 11})}^{2}}$

$F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$ $F = 1, {3.10}^{- 10} N$

Đáp án cần chọn là: B

[ĐGNL- BKA] Vấn đề thuộc lĩnh vực vật lí - Mẫu nguyên tử Bo