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Recent questions tagged physics
Questions
In Germanium it is found that concentration of conducting electron is $3 \times 10^{19} $ per cubic meter. When Phosphorus impurity is doped the concentration of conducting electron increases to $2 \times 10^{23}$ per cubic meter. If product of hole concentration and conducting electron is independent of amount of impurity find the hole concentration in doped Germanium.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jan 27, 2014
by
meena.p
1
answer
In the given circuit, potential barriers developed across diode is $0.5 v$ . Find the current in the circuit.
jeemain
physics
class12
unit19
ch14
q21
medium
asked
Jan 27, 2014
by
meena.p
1
answer
Which of the following is reverse biased diode.
jeemain
physics
class12
unit19
ch14
q20
easy
concepts
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
In LEDs one can see emitted light to because
jeemain
physics
class12
unit19
ch14
q19
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Avalanche breakdown is due to
jeemain
physics
class12
unit19
ch14
q18
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Zener breakdown occurs:
jeemain
physics
class12
unit19
ch14
q17
easy
junction-diodes
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
The approximate ratio of resistance in forward bias of p-n junction is
jeemain
physics
class12
unit19
ch14
q16
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
The conduction band of a solid is partially filled at OK.Then the solid is
jeemain
physics
class12
unit19
ch14
q15
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Electrical conductivity of pure germanium can be increased by 1) increasing the temperature 2) doping with donor impurities 3) radiation with ultra violet rays. 4) doping with acceptor impurities
jeemain
physics
class12
unit19
ch14
q14
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
In a p-n junction the depletion region is $200 nm$ wide and a electric field of $10^6 vm^{-1}$ exists in it. What is the minimum kinetic energy of conducting electron to diffuse through the barriers.
jeemain
physics
class12
unit19
ch14
q13
medium
pn-junction
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
In pure semiconductor number of conducting electrons is $5 \times 10^{20} $ per cubic meter. How many holes are there in $1 cm^3$ of the same semiconductor.
jeemain
physics
class12
unit19
ch14
q12
medium
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
The impurity atom with which pure silicon can be doped to make p-type semiconductors are
jeemain
physics
class12
unit19
ch14
q11
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
What is intensity of electric field in the depletion region of which $2.5 \times 10^{-7} m$ if the potential barrier is $0.50 v$
jeemain
physics
class12
unit16
ch14
q10
easy
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
A p type semiconductor has acceptor level of 50 mev above the valance band. Find the maximum wave length of light which can create a hole.
jeemain
physics
class12
unit19
ch14
q9
easy
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
The diffusion current in p-n junction is due to
jeemain
physics
class12
unit19
ch14
q8
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Electronic conduction to in a semiconductor takes place due to
jeemain
physics
class12
unit19
ch14
q7
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Which of the following are incorrect statements about a transistor?
jeemain
physics
class12
unit19
ch14
q6
medium
concepts
semiconductor-electronics
pn-junction
transistors
asked
Jan 27, 2014
by
meena.p
1
answer
The reverse bias in p-n junction
jeemain
physics
class12
unit19
ch14
q5
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
In p-n junction diode : the depletion zone has
jeemain
physics
class12
unit19
ch14
q4
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Semi conductors doped with donor atoms have majority carriers as
jeemain
physics
class12
unit19
ch14
q3
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
Fermi energy is
jeemain
physics
class12
unit19
ch14
q2
easy
concepts
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
Which of the following is true about semiconductors?
jeemain
physics
class12
ch14
semiconductor-electronics
concepts
easy
asked
Jan 27, 2014
by
meena.p
1
answer
A plate of thickness x made of refractive index $\mu $ is placed in front of one of the slits in a double slit experiment. What should be minimum thickness x . so that the central maxima turns to fringe with minimum intensity
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
Equi convex lens is placed such that optic axis coincides with the x-axis, position of object is $(-40 \;cm, 1 \;cm) $ and position of image $(50 \;cm, -2\;cm) $ where is the lens located
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
A ray of light is incident on a prism of refractive index $\mu =\sqrt 2$ It is found that the deviation caused is $30^{\circ}$ The angle of prism is $60^{\circ}$ What will be the angle between the ray inside the prism and the base of the prism .
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
A prism of refractive index $\mu =1.5 $ of vertical angle $6 ^{\circ}$ is placed in front of a mirror. A ray of light is incident normally on one of the face of the prism as shown. What is the total deviation caused by the system.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
Two waves have a phase difference of $\pi $. and they have light intensities I and 9I. What will be the resultant intensity .
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
asked
Jan 24, 2014
by
meena.p
1
answer
Find the width of central maxima given $\lambda = 5 \times 10^{-5}\;cm$ slit separation $d= 0.15 \;cm$ and distance between screen and slit $D= 2.1 \;m$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Jan 24, 2014
by
meena.p
1
answer
An unpolarised light is incident on a glass plate at polarizing angle $57^{\circ}$ with the normal on a glass plane. The reflected light will be
jeemain
physics
class12
unit16
wave-optics
polarisation
medium
asked
Jan 24, 2014
by
meena.p
1
answer
In Young's double slit experiment the distance between adjacent fringe is x and L is distance between slit and screen. If d is split separation , then wave length is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 24, 2014
by
meena.p
1
answer
An interference pattern is observed in a young 's double slit experiment in air. Now this chamber is evacuated and the same light is used we will see .
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 24, 2014
by
meena.p
1
answer
Wave nature of light explains the phenomenon of
jeemain
physics
class12
unit16
wave-optics
introduction-to-wave-optics
easy
asked
Jan 24, 2014
by
meena.p
1
answer
A ray of light passes through four transparent media with refractive indices $\mu_1, \mu_2, \mu_3$ and $\mu_4$ as shown. The surface of all media are parallel. The emerging say CD is parallel to incident ray AB, Then ,
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
In Lloyd's single mirror experiment A light wave emitted directly from sources s interferes with a wave reflected from a mirror M. The interference pattern is formed on the screen which is kept perpendicular to the mirror and at a distance. $D=1 m$ from the source as shown . If the sources is at a distance of 1 mm from the plane of the mirror what is the fringe width when monochromatic light of 600 nm is incident from the sources
jeemain
physics
class12
unit16
wave-optics
interference
difficult
asked
Jan 24, 2014
by
meena.p
1
answer
By what percentage should the volume be decreased to increase the pressure by 10% at constant temperature?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 24, 2014
by
balaji.thirumalai
1
answer
In a young's double slit experiment illuminated by monochromatic light the slit separation is $0.3\;mm$ and slit- screen separation is $1.5 \;m$. If fourth bright fringe is 1 cm from central bright fringe, the wavelength of light used is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Jan 24, 2014
by
meena.p
1
answer
If the speed of sound in Hydrogen at NTP is equal to the speed of sound in carbon-di-oxide at $T_0$, what is the value of $T_0$? (i.e, $T = 273K$)
speed-of-molecules
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
medium
asked
Jan 24, 2014
by
balaji.thirumalai
1
answer
Sound travels with a speed $v$ in hydrogen gas at NTP. At what temperatures does carbon-di-oxide have a rms (root mean square) velocity of $2v$ (Note: $T_0 = 273K$ and $\gamma$ for $H_2 = \large\frac{7}{5}$)
speed-of-molecules
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-energy-and-temperaturemedium
asked
Jan 24, 2014
by
balaji.thirumalai
1
answer
In a young's double slit experiment the fringe width is $0.05\;mm$ when the distance of screen from slit is $75 \;cm$ . If the distance of screen from the slit is increased by $25 \;cm$ , the fringe width will be
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Jan 23, 2014
by
meena.p
1
answer
A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minimum for red light of wavelength $\lambda =650 \;nm$ appear for $\theta =30^{\circ}$?
jeemain
physics
class12
unit16
wave-optics
diffraction
medium
asked
Jan 23, 2014
by
meena.p
1
answer
What is the angular separation between two lines of $\lambda_1 =5882 \mathring{A}$ and $\lambda_2 =5852 \mathring{A}$ in first order grating with 6000 lines per cm in normal incidence.
jeemain
physics
class12
unit16
wave-optics
diffraction
medium
asked
Jan 23, 2014
by
meena.p
1
answer
A thin film of oil of $\mu =1.2 $ floats on watch of $\mu_w =\large\frac{4}{3}$. A monochromatic light of wave length $\lambda= 9600 A^{\circ} $ falls normally and it appears dark. What must be minimum change in thickness of oil film which will appear bright if normally reflected by same light.
jeemain
physics
class12
unit16
wave-optics
interference
difficult
asked
Jan 23, 2014
by
meena.p
1
answer
The temperature at which the most probably speed of oxygen is equal to the rms velocity of hydrogen at NTP is?
speed-of-molecules
easy
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
The temperature at which the velocity of Helium is four times the velocity of Hydrogen at NTP is?
speed-of-molecules
easy
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. The molar mass of the gas is M. Which of the following cannot be an expression for density of an ideal gas?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. The molar mass of the gas is M. Then the temperature at which the sample of gas will weight m is given by which of the following options?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. Then the number of molecules in the sample is?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
For an ideal gas, average kinetic energy per degree of freedom is?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
degrees-of-freedom
kinetic-interpretation-of-temperature
easy
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
A bubble of an ideal gas is trapped in a liquid filled in a container. As the bubble moves upwards besides the buoyancy force, the forces acting on it are:
kinetic-theory-of-an-ideal-gas
jeemain
physics
kinetic-theory-of-gases
class11
ch13
pressure-of-an-ideal-gas
easy
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
Which of the following quantities is larger for a diatomic has than that of a monoatomic gas?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
easy
specific-heat-capacity
atomicity
asked
Jan 23, 2014
by
balaji.thirumalai
1
answer
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