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16. The equation for the radius of the orbit of quantum number n is given by
A.
B.
C.
D.
Explanation:
17. According to Rutherford atom model, the electrons are revolving around the nucleus so that centripetal force is provided by
A. nuclear force
B. gravitational force
C. electrostatic force of attraction between electron and nucleus
D. Van der Wall’s force
Explanation:
18. The energy required to remove an electron from the orbit of hydrogen atom is called
A. ionization energy
B. potential energy
C. kinetic energy
D. excitation energy
Explanation:
19. The series of the hydrogen spectral lines given by the expression 1/λ = R  (1/12 – 1/n2), n=2, 3, 4, … is
A. Balmer series
B. Lyman series
C. Paschen series
D. Pfund series
Explanation:
20. An atom is made up of a number of electrons embedded in a sphere of positive charge. This was proposed by
A. Prout
B. Dalton
C. Thomson
D. Rutherford
Explanation:
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