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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION

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)

ANSWER

EXPLANATION

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