- AAbove the conduction band of the host crystal.
- BClose to the valence band of the host crystal.
- CClose to the conduction band of the host crystal.
- DBelow the valence band of the host crystal.
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The phenomenon of radioactivity is
|
(a) Exothermic change which increases or decreases with temperature |
|
(b) Increases on applied pressure |
|
(c) Nuclear process does not depend on external factors |
|
(d) None of the above |
The bending of beam of light around corners of obstacles is called
|
(a) Reflection |
(b) Diffraction |
(c) Refraction |
(d) Interference |
The apparent vertical shift of the image of a coin placed at the bottom of a water tank having constant depth of water is proportional to (given refractive index of water = $\mu$).
In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the sits. If the screen is moved by 5 towards the slits, the change in fringe width is 3
. If separation between the slits is
, the wavelength of light used is
|
(a) 6000 Å |
(b) 5000 Å |
(c) 3000 Å |
(d) 4500 Å |
An electric dipole is placed in an electric field generated by a point charge
|
(a) The net electric force on the dipole must be zero |
|
(b) The net electric force on the dipole may be zero |
|
(c) The torque on the dipole due to the field must be zero |
|
(d) The torque on the dipole due to the field may be zero |