First slide

Bohr's atom model

Question

According to Bohr's theory of hydrogen atom, the product of the binding energy of the electron in the nth orbit and its radius in the n^th orbit

Moderate

A

is proportional to n²
B

is inversely proportional to n³
C

has a constant value of 10.2 eV- $Å$
D

has a constant value of 7 .2 eV- $Å$

Solution

$E_{n} \propto \frac{1}{n^{2}} and r_{n} \propto n^{2}$
$Therefore, E_{n} r_{n} is independent of n .$
$\begin{array}{rcl} Hence, E_{1} r_{1} & = & (13.6 eV) (0.53 Å) \\ = & 7.2 eV - Å = constant \end{array}$

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