Atomic Physics – 1 – 3

11. According to Bohr’s theory the radius of electon in an orbit described by Principal quantum number n and atomic number Z, is Proportional to :

(a) Z2n2
(b) n2/Z
(c)  Z2/n
(d) n2/Z2

Answer
Answer : (b)

Explanation
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12. If 13.6eV energy is required to ionize the hydrogen atom the energy required to remove the electron form n=2 state is :

(a) Zero
(b) 3.4eV
(c) 6.8eV
(d) 10.2eV 

Answer
Answer : (b)

Explanation
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13. If the radius of a nucleus of mass number 3 is R. then the radius of a nucleus of mass number 81 is :

(a) 3R
(b) 9R
(c) 27R
(d) 81R

Answer
Answer : (a)

Explanation
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14. Ionization energy of hydrogen atom in ground state is :

(a) 13.6 J
(b) 13.6 eV
(c) 13.6 MeV
(d) 13.6 V

Answer
Answer : (b)

Explanation
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15. Which of the following atom has the lowest ionization potential ?

(a) 7N14
(b) 18Ar40
(c) 55Cs133
(d) 8O16

Answer
Answer : (c)

Explanation
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