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
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
33. The solid which has no periodic structures at all is called as :
(a) Crystalline solid
(b) Amorphous solid
(c) Polycrystalline solid
(d) Solids
34. Diffusion constant for electron is …….. to hole.
(a) Equal
(b) Greater than
(c) Lesser than
(d) Can’t be determined
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)
Related Posts
Atoms and Electrons » Exercise - 150. When an electron moves from lower orbit to a higher orbit : (a) Emission of energy takes place (b) Absorption of energy takes place (c) Size of atom increases (d) Either absorption or emission of energy takes place- Atoms and Electrons » Exercise - 17. When an electron moves from a higher orbit to a lower orbit : (a) emission of energy takes place (b) absorption of energy takes place (c) size of the atom increases (d) either absorption or emission of energy takes place
- Atoms and Electrons » Exercise - 13. If an atom has an atomic number of 6, then it has : (a) 3 electrons & 3 protons (b) 4 electrons & 2 protons (c) 2 electrons & 4 protons (d) 6 electrons & 6 protons
- Atoms and Electrons » Exercise - 15. The maximum number of electron that an M-shell of an atom can contain is : (a) 4 (b) 12 (c) 18 (d) 34
- Atoms and Electrons » Exercise - 12. Emission of a beta particle from an atom : (a) increases the number of protons in an atom (b) increases the number of neutrons in an atom (c) decreases the number of protons in an atom (d) decreases the number of neutrons in an atom