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Q.

If the radius of first Bohr orbit of $H e^{+}$ ions is $x c m$ and radius of $4^{t h}$ Bohr orbit of $B e^{+ 3}$ is $y c m$ , then calculate the value of $y / x$

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a

$5$

b

$6$

c

$8$

d

$7$

answer is C.

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Detailed Solution

$r_{1} = 0.529 \times \frac{1^{2}}{2} A^{o} = x r_{4} = 0.529 \times \frac{4^{2}}{4} A^{o} = y \frac{y}{x} = 4 \times 2 = 8$

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