- ATheir ability to conduct current
- BThe type of crystal lattice
- CBinding energy of their electrons
- DRelative widths of their energy gaps
Explanation:
According to band theory, distinction between conductors, insulators and semiconductors is based on relative width of energy gaps between valence band and conduction band.
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The length of a wire of a potentiometer is 100 cm, and the emf of its standard cell is E volt. It is employed to measure the e.m.f of a battery whose internal resistance is 0.5 W. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is (where i is the current in the potentiometer)
|
(a) |
(b) |
(c) |
(d) |
The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to
|
(a) The charge on the particle |
(b) The momentum of the particle |
|
(c) The energy of the particle |
(d) The intensity of the field |
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is
|
(a) |
(b) |
(c) |
(d) |
There is 10 units of charge at the centre of a circle of radius 10m. The work done in moving 1 unit of charge around the circle once is
|
(a) Zero |
(b) 10 units |
(c) 100 units |
(d) 1 unit |
Radius of central zone of circular zone plate is 2.3 mm. Wavelength of incident light is 5893. Source is at a distance of 6m Then the distance of first image will be
|
(a) 9 m |
(b) 12 m
|
(c) 24 m |
(d) 36 m |
In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by
|
(a) 12 |
(b) 18 |
(c) 24 |
(d) 30 |
In the arrangement of resistances shown below, the effective resistance between points A and B is
|
(a) 20 Ω |
(b) 30 Ω |
(c) 90 Ω |
(d) 110 Ω |