Explanation:
On increasing the temperature of a semi-conductor material, the density of charge increases which apparently increases the hinderance and thus decreases their mobility.
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X-rays cannot be deflected by means of an ordinary grating due to
|
(a) Large wavelength |
(b) High speed |
(c) Short wavelength |
(d) None of these |
At room temperature, a P-type semiconductor has
|
(a) Large number of holes and few electrons |
|
(b) Large number of free electrons and few holes |
|
(c) Equal number of free electrons and holes |
|
(d) No electrons or holes |
A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge – Q. The surface charge density on the inner and outer surfaces of the spherical shell will be
|
(a) |
(b) |
(c) 0, |
(d) None of the above |
If 3 charges are placed at the vertices of equilateral triangle of charge ‘q’ each. What is the net potential energy, if the side of equilateral ∆ is l cm
|
(a) |
(b) |
(c) |
(d) |
If 
and 
are respectively the filament resistances of a 200 watt bulb and 100 watt bulb designed to operate on the same voltage, then
|
(a) |
(b) |
|
(c) |
(d) |
$\frac{\lambda}{4}$
$\frac{\lambda}{3}$
$\frac{\lambda}{2}$
$\lambda.$
