| (I) Orbiting speed of electrons decreases as it falls to discrete orbits away from the nucleus. |
| (II) Radii of allowed orbits of electrons are proportional to the principal quantum number. |
| (III) Frequency with which electrons orbit around the nucleus in discrete orbits is inversely proportional to the principal quantum number. |
| (IV) Binding force with which the electron is bound to the nucleus increases as it shirts to outer orbits. Select the correct answer using the codes given below: |
A) I and III
B) II and IV
C) I, II and III
D) II, III and IV
Correct Answer: A
Solution :
[a] In case of Bohr's model of hydrogen atom, orbital speed varies inversely as the radius of the orbit and energy increases with increase in quantum number. Further frequency \[=\frac{v}{2\pi r}\] Here \[v\propto \frac{1}{n}\]and \[r\times {{n}^{2}}\] Frequency \[\propto \frac{1}{n}\]
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