Assertion :The kinetic energy of an electron orbiting in third orbit is less than the electron orbiting in second orbit. Reason: As we move away from the nucleus the forces of attraction between electron and the nucleus increases

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$E_{K} = \frac{Z e^{2}}{2} \cdot \frac{4 π^{2} m e^{2} Z}{n^{2} h^{2}}$
$∴ E_{K} \propto \frac{1}{n^{2}}$
Therefore, kinetic energy of an electron orbiting in third orbit (n=3) is less than the electron orbiting in the second orbit $(n = 2)$ .
Therefore, assertion is correct.
But as we move away from the nucleus the forces of all attractions between electron and the nucleus decreases.

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