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Recent questions tagged easy
Questions
What is the momentum of an electron with kinetic energy of $120\; ev$ given $(h= 6.63 \times 10^{-34}\;Js, lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Calculate the momentum and de-Broglie wave length of the electrons acceleration through a potential difference of $56\; v.$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Light of wave length 488 nm is produced by an argon laser which is used in the photo electric effect . When light from this spectral line is incident on the cathode , the stopping potential of photo electrons is $0.30\;ev$ . Find the work function of the material from which the cathode is made. given $(h= 6.63 \times 10^{-34}\;Js, lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Light of wave length 488 nm is produced by an argon laser which is used in the photo electric effect . When light from this spectral line is incident on the cathode , the stopping potential of photo electrons is $0.30\;ev$ . Find the work function of the material from which the cathode is made.given $(h= 6.63 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Light of frequency $7.21 \times 10^{14} Hz$ is incident on a metal surface . Electron with a maximum speed of $6.0 \times 10^5\;ms^{-1}$ are ejected from the surface. What is the threshold frequency for photo emission of electron ? $ h =6.63 \times 10^{-34}Js, m_e=9.1 \times 10^{-31} \;kg$
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 22, 2016
by
meena.p
1
answer
The threshold frequency of a certain metal is $3.3 \times 10^{14}\;Hz$ . If light of frequency $8.2 \times 10^{14}\;Hz$ is incident on the metal, Predict the cut off voltage for photo electric emission . Given Planck's Constant , $h= 6.62 \times 10^{-34} \;Js$
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 22, 2016
by
meena.p
1
answer
A 100 w sodium lamp radiates energy uniformly in all directions. The lamp is located at the center of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is $589\;nm$ At what rate are the photons delivered to the sphere ?
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 22, 2016
by
meena.p
1
answer
A 100 w sodium lamp radiates energy uniformly in all directions. The lamp is located at the center of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is $589\;nm$ what is the energy associated per photon with the sodium light ?
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 22, 2016
by
meena.p
1
answer
Is an experiment on photo effect, the slope of the cut off voltage versus frequency of incident light is found to be $4.12 \times 10^{-15} Vs $ given $e= 1.6 \times 10^{-19}\;c$ estimate the value of planes constant
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
The energy flux of sun light reaching the surface of the earth is $1.388 \times 10^3 w/m^2$. How many photons (nearly) per sq.m are incident on the earth per sec ? Assume that the photons in the sunlight have an average wave length of $550 \;nm$
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
Monochromatic light of wave length $632.8\;nm$ is produced by a helium - neon laser. The power emitted is $9.42\;mw$. How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon .
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
Monochromatic light of wave length $632.8\;nm$ is produced by a helium - neon laser. The power emitted is $9.42\;mw$. How many photons per energy, on the average, arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross - section which is less than the target area )
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
Monochromatic light of wave length $632.8\;nm$ is produced by a helium - neon laser. The power emitted is $9.42\;mw$. Find the energy and momentum of each photon in the light beam
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
The photoelectric cut off voltage in a certain experiment is $1.5 \;v$ What is the maximum kinetic energy of photo electron emitted ?
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
The work function of caesium metal is $2.14$ ev when light of frequency $6 \times 10^4 \;Hz$ is incident on the metal surface , photo emission of electron occur. what is the a) maximum speed of the emitted photo electrons
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
The work function of caesium metal is $2.14$ ev when light of frequency $6 \times 10^4 \;Hz$ is incident on the metal surface , photo emission of electron occur. what is the stopping potential
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
The work function of caesium metal is $2.14$ ev when light of frequency $6 \times 10^4 \;Hz$ is incident on the metal surface , photo emission of electron occur. what is the a) maximum kinetic energy of emitted electrons
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
Find the minimum wave length of x - rays produced by $30\; kv$ electron . given $h= 6.63 \times 10^{-34}\;Js$
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
Find the maximum frequency of x- rays produced by $30\; kv$ electrons. Given, $h= 6.63 \times 10^{-34}\;Js$
cbse
class12
physics
ch-11
sec-a
ncert
easy
asked
Jun 21, 2016
by
meena.p
1
answer
With what speed should a galaxy move with respect to us so that the sodium line at $589.0\;nm$ is observed at $589.6 \;nm? $
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The refractive index of a medium is $ \sqrt 3$ What is the angle of refraction , if the un polarized light is incident on it at the polarizing angle of the medium
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The $6563 A^{\circ}\; H _{\alpha}$ line emitted by hydrogen in a star is found to be red shifted by $15^{\circ}A$ Estimate the speed with which the star is receding from the earth .
cbse
class12
physics
ch-10
sec-b
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
In a double slit experiment , the distance between slits is increased ten times where as their distance from screen is halved , then what is the fringe width ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
A layer beam is used for locating distant object because
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is $ \large\frac{3}{2}$ is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
X- rays cannot be diffracted by means of ordinary grating because of ,
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
For an aperture of size 'a' illuminated by a parallel beam of light having wavelength $\lambda$ , the Fresnel distance is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Resolving power of telescope can be increased by increasing
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Two waves have intensity ratio $25:4$. what is the ratio of maximum to minimum intensity ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Which of the phenomenon is not common to sound and light wave :
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
In a Fresnel bi prism experiment, the two position of lens, give separation between the slits as $16\;cm$ and $9\;cm$ respectively . What is the actual distance of separation?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
What is the pair difference for destructive interface ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
A ray of light strikes a material slab at an angle of incident $60^{\circ}$ . If the reflected and refracted rays are perpendicular to each other, the refractive index of the material is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The colours seen in the reflected white light form a thin oil flim due to
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Which among the following is a form of energy ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The initial shape of the wave front of the beam is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Wave length of light used in an optical instrument are $ \lambda_1=4000^{\circ}A$ and $ \lambda_2=5000^{\circ}A$ then ratio of their respective resolving power .(corresponding to $\lambda_1$ and $\lambda_2$) is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The phase difference between two waves reaching a point is $ \frac{\pi}{2}$ . What is the resultant amplitude if the individual amplitude are 3 mm and 4 mm ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Two cohered source emit waves of amplitude a and 2a. They meet at a point P equidistant from the two sources. If the intensity of the first is I , what is the resultant intensity at point p?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Two slits in younger double slit experiment have width in the ratio $81:1$ what is the ratio of the amplitudes of light waves from them ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Is the contract fringe bright or dark in young's double slit experiment ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What is Brewster's angle from air to glass transition ? ($\mu$ for glass is 1.5)?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
The refractive index of glass is 1.5 what is the speed of light in vaccum is $3.0 \times 10^8 \;ms^{-1}$
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Green light is incident at the polarizing angle of a certain glass plate . The angle of refraction is $32^{\circ}$ . What is the index of refraction of glass ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
A single slit diffraction pattern is completely immersed in water without changing any parameter. How is the width of central maximum affected ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What is the polarizing angle of a medium in which the angle of refraction is $33^{\circ}$
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
A diffraction grating has 5000 lines per cm, what is its grating element?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Two slits $0.125 mm$ apart are illuminated by light of wave length $4500 A^{\circ}$. The screen is 1 m away , from the plane of the slits. Find the separation between the second bright finge on both sides of the central maximum .
cbse
class12
physics
ch-10
sec-b
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Estimate the distance for which ray optics is good approximate for an aperture of 4mm and wave length 400 nm .
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Two convex lenses of same focal length but of aperture $A_1$ and $A_2\; (A_2 < A_1)$ are used as the objective lenses in two astronomical telescope having identical eye pieces. What is the ratio of then resolving power ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
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