66. The electrons in the third orbit of an atom have …….. energy than the electrons in the second orbit.
(a) more
(b) less
(c) the same
(d) none of the above
67. When an electron jumps from higher orbit to a lower orbit, it …….. energy.
(a) absorbs
(b) emits
(c) sometimes emits, sometimes absorbs
(d) none of the above
68. The electrons in the conduction band are known as ……..
(a) bound electrons
(b) valence electrons
(c) free electrons
(d) none of the above
69. In insulators, the energy gap between valence and conduction bands is ……..
(a) very large
(b) zero
(c) very small
(d) none of the above
70. In a conductor, the energy gap between valence and conduction bands is ……..
(a) large
(b) very large
(c) very small
(d) none of the above
Related Posts
Atoms and Electrons » Exercise - 282. An electron in the conduction band - (a) Has a lower energy than an electron in the valence band (b) Has a higher energy than an electron in the valence band (c) Is located near the surface of the solid (d) Is bound to its parent atom- Atoms and Electrons » Exercise - 287. An electron is termed free electron, if found in - (a) Conduction band (b) Forbidden gap (c) Valence band (d) Either in valence band or conduction band
- Atoms and Electrons » Exercise - 280. The energy gap between valence and conduction bands in insulators is about ........ (a) 15 eV (b) 1.5 eV (c) zero (d) 0.5 eV
- Atoms and Electrons » Exercise - 277. In insulators, the energy gap between valence and conduction bands is ........ (a) very large (b) zero (c) very small (d) none of the above
- Atoms and Electrons » Exercise - 272. The energy gap between valence and conduction bands in insulators is about ........ (a) 15 eV (b) 1.5 eV (c) zero (d) 0.5 eV