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# Atoms and Electrons – 1 – 7

31. The relation between the energy released and frequency of the emitted radiation of an atom is given by the expression :

(a) ΔE = h/f
(b) ΔE = h + f
(c) ΔE = h f
(d) ΔE = 1 + h/f

Explanation
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32. The elements in a periodic table are arranged, based on the increasing order of :

(a) Atomic number
(b) Mass number
(c) Molecular weight
(d) Alphabetical order

Explanation
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33. The solid which has no periodic structures at all is called as :

(a) Crystalline solid
(b) Amorphous solid
(c) Polycrystalline solid
(d) Solids

Explanation
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34. Diffusion constant for electron is …….. to hole.

(a) Equal
(b) Greater than
(c) Lesser than
(d) Can’t be determined

Explanation
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35. The velocity of the electron in the nth orbit is given by the equation :

(a) Vn= (hn/ πmrn)
(b) Vn= (πh2/ mrn)
(c) Vn= (n(h/2π)/ mrn)
(d) Vn= (nh/2πmrn)