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Bohr's Model of a Hydrogen Atom

Which is not ...

Question

Which is not a correct order of energy for 1st, 2nd and 3rd orbit?

A

E_{1} > E_{2} > E_{3}

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B

(P E)_{1} < (P E)_{2} < (P E)_{3}

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C

(K E)_{1} > (K E)_{2} > (K E)_{3}

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D

A and C both

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Solution

The correct option is A $E_{1} > E_{2} > E_{3}$
The correct order for the energy for first, second and third orbit is

$E_{1} < E_{2} < E_{3}$ .

$E_{n} \propto \frac{- 1}{n^{2}}$

Higher is the value of n, less negative is the energy.
Thus energy increases with orbit number.

Hence, the correct option is $A$

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