Solution:
As we apply electric field is applied across a semiconductor, the electrons in the conduction band acquire energy and get accelerated. They travel from lower energy level to higher energy level. While the holes in valence band travel from higher energy level to lower energy level, where they will be having more energy.
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A wave is propagating in a medium of electric dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is
|
(a) 5 W |
(b) 376.6 W |
(c) 1883 W |
(d) 3776 W |
According to corpuscular theory of light, the different colours of light are due to
|
(a) Different electromagnetic waves |
|
(b) Different force of attraction among the corpuscles |
|
(c) Different size of the corpuscles |
|
(d) None of the above |
Two metallic spheres of radii 1 cm and 2 cm are given charges 
and 5 × respectively. If they are connected by a conducting wire, the final charge on the smaller sphere is
|
(a) 3 |
(b) 1 |
(c) 4 |
(d) 2 |
A 50 volt potential difference is suddenly applied to a coil with 
henry and R = 180 ohm. The rate of increase of current after 0.001 second is
|
(a) 27.3 amp/sec |
(b) 27.8 amp/sec |
(c) 2.73 amp/sec |
(d) None of the above |
An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force
|
(a) Along the axis |
(b) Perpendicular to the axis |
|
(c) At an angle of 4o with axis |
(d) No force experienced |
One proton beam enters a magnetic field of 
T normally, Specific charge = 
. velocity = 
. What is the radius of the circle described by it
|
(a) 0.1 m |
(b) 1 m |
(c) 10 m |
(d) None of these |
The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is
|
(a) 0.168 eV |
(b) 16.8 eV |
(c) 1.68 eV |
(d) 2.5 eV |
