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An alpha particle and a proton are accelerated from rest through the same potential difference V. Find the ratio of de-Broglie wavelengths associated with them.
Sir,plz explain Davisson Germer experiment?
write the laws of photoelectric effect by using Einstein's photo electric equations.
What si the conclusion of Davisson and Germer experiment?
sir in formula kmax = eVo why it is not only Kmax = Vo for maximum energy of electron
Define intensity of radiation on the basis of photon picture of light. Write its SI unit.
Plzz tell the answer pah...
2 positive charges 9nc and 4nc are placed at the points A and C respectively of a right angled triangle ABC in which angle B =90,AB=3cm and BC=2cm.find the magnitude and direction of the resultant electric field at B.
how p=hv/c? plz explain
The following graph shows the variation of stopping potential V0 with the frequency ν of the incident radiation for two photosensitive metals X and Y:
(i) Which of the metals has larger threshold wavelength? Give reason.
(ii) Explain giving reason, which metal gives out electrons, having larger kinetic energy, for the same wavelength of the incident radiation.
(iii) If the distance between the light source and metal X is halved, how will the kinetic energy of electrons emitted from it change? Give reason
(i) Let = Frequency of incident radiations of metal Y
= Frequency of incident radiations of metal X
Therefore, metal X has larger threshold wavelength.
(ii) Since the kinetic energy of the emitted electrons is directly proportional to the frequency of incident radiation, metal Y having larger incident frequency will have larger kinetic energy.
∴ Metal Y has larger kinetic energy.
(iii) Kinetic energy of the emitted photoelectrons is independent of the intensity of the incident light. Hence, kinetic energy of the emitted photoelectrons remains unchanged if the distance between the light source and metal X is halved.
in this in (ii) part why work function.is not considered kindly reply fast... ??
The wavelength lambda , of a photon & the de-broglie wavelength of an electron have the same value.show that the energy of the photon is (2*lambda*m*c)/h times the kinetic energy of the electron, where m,c,h have their usual meanings..
explain the photovoltaic cells and photoconductive cells
The work function of caesium is 2.14eV.find a)threshold frequency.b) the wavelength of incident light if the photocurrent is brought to zero by a stopping potential of 0.60v
what is exact mening of " nature loves symmetry "in the defenition of dual nature matter???? pls explain.....
What is the shortest wavelength present in the Paschen series of spectral lines?
Given that photon of light of wavelength 10000 Ao has an energy equal to 1.23 eV. When a light of wavelength 5000Ao adn intnsity I falls on photoelectric cell, the surface current is 0.40 X 106 A. Stopping potential is 1.36eV, then what is the work function? (1 Ao = 10-10m)
state how in a photocell the work-function of the metal depend upon the kinetic energy of emitted electron.
define intensity of light?
why is quartz window used in experiment for photoelectric effect?
If the frequency of incident light on a metal surface is doubled for the same intensity . What is the change observed in Kinetic Energy of the photoelectrons emitted?
An electron and a photon each have a wavelength of 1.00 nm. Find
(a) their momenta,
(b) the energy of the photon, and
(c) the kinetic energy of electron.
When a given photosensitive material is irradiated with light of frequency V , the maximum speed of the emitted photoelectrons equals Vmax. The square of Vmax, i.e., Vmax2, is observed to vary with , as per the graph shown here. Obtain expressions(i) Planck’s constant, and(ii) The work function of the givenphotosensitive material,in terms of the parameters n and the mass, m, of the electron.
AN ELECTRON AND ALPHA PARTICLE HAVE THE SAME de-Broglie WAVE LENGTH ASSOCIATED WITH THEM .HOW ARE THEIR KINETIC ENERGIES RELATED ?
draw a graph showing the variation of de broglie wavelength of an electron with variation of its momentum
hertz and lenard's observations in photoelectric effect
An unpolarised light is incident on the boundary between two transport media.State the condition when the reflected wave is totally plane polarised. Find out the expression for the angle of incidence in this case.
Can by increasing intensity of incident radiation, velocity of emitted photoelectrons be increased? Explain. What will be then the effect of increasing intensity?
why does the bluish color predominate in a clear sky
The stopping potential in an experiment on photo electric effect is 1.5V. What is the max K.E of the photo electrons emitted ?
what is SATURATION CURRENT????
Why wave nature of light fails to satisfy photoelectric effect....?
DERIVE EINSTEINS PHOTOELECTRIC EQUATION?
Light of frequency 1.5 times the threshold frequency is incident on a photo-sensitive material. if the frequency is halved and intensity is doubled,the photo current becomes?
light at a place is given as E = Eo sin (wt) which falls on a metal surface having work function W. calculate the max. K.E. of a photoelectron.
two metals A and b have work function 2eV and 4eV respectively which of the metals has a smaller threshold wavelenght? pls solve ftafat
How does the maximum kinetic energy of electrons emitted vary with the work function of the metal??
An alpha particle after passing through a potential difference of 2 M V falls on a silver foil. The atomic number of silver is 47. Calculate (1) K.E. of alpha particle at a distance of 50 fm from the nucleus and (2) the shortest distance from the nucleus of silver to which the alpha particle reaches.
where is the question paper of last 5 years in this site thet was told by nitish ku gupta sir can u help me to find out
De-broglie wavelength associated with an electron accelerated through a potential difference V is lambda. , what will b its wavelength , when accelerating potential is increased to 4V.
Here, why cant we use the formula '' lambda= 1.22/root V '' and this formula is applicable in what type of quests.?
Why de broglie waves associated with a moving football are not visible?
In an experiment, a bulb of power 1000 W produces 1010 photons/second. The radiation belongs to a part of the spectrum called
γ-rays
X-rays
ultraviolet rays
microwaves
is it correct to say that we can know the kinetic energy of the electrons by stopping potential??what if stopping potential is very high (larger that Kinetic Energy of electrons)...then also it will prevent electrons from going to the collector..but it will not give the correct value for kinetic energy of electrons..
Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?
X-rays r used to irradiated sodium & copper surface in two separate experiments & stopping potential determined. This stopping potential is
1.)equal in both case
2.)greater for sodium
3.)greater for copper
4.)infinite in both cases
ans it wid explanation. plzzzz ans soon.......
Define threshold frequency?
the extent of localisation of a particle is determined roughly by its de broglie wavelength.if an electron is localized within the nucleus (of size of about 10^-14m) of an atom, what is its energy?In the solution of this question wavelength is taken to be10^-14m. but i can't understand how size of nucleus is equal to wavelength?
Determine the de-Broglie wavelength of a proton whose kinetic is equal to rest mass energy of an electron (rest mass energy = m0c2 & mp = 1840me )
write einstien photoelectric equation and point any two characterstic property of photon on which this equation is based?
What is the
(a) momentum,
(b) speed, and
(c) de Broglie wavelength of an electron with kinetic energy of 120 eV.
what is velocity selector?
Can pair production take place in vaccum..?
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Syllabus
An alpha particle and a proton are accelerated from rest through the same potential difference V. Find the ratio of de-Broglie wavelengths associated with them.
(1)
(2)
(3) m = 0
(4) m = M
Sir,plz explain Davisson Germer experiment?
write the laws of photoelectric effect by using Einstein's photo electric equations.
b) Explain the laws of photoelectric emission on the basis of Einstein's photoelectric equation.
What si the conclusion of Davisson and Germer experiment?
sir in formula kmax = eVo why it is not only Kmax = Vo for maximum energy of electron
Define intensity of radiation on the basis of photon picture of light. Write its SI unit.
Plzz tell the answer pah...
2 positive charges 9nc and 4nc are placed at the points A and C respectively of a right angled triangle ABC in which angle B =90,AB=3cm and BC=2cm.find the magnitude and direction of the resultant electric field at B.
of light incident on the surface changes from lambda1 to lambda2. Derive the expressions for the
threshold wavelength lambdao and work function for the metal surface.
how p=hv/c? plz explain
The following graph shows the variation of stopping potential V0 with the frequency ν of the incident radiation for two photosensitive metals X and Y:
(i) Which of the metals has larger threshold wavelength? Give reason.
(ii) Explain giving reason, which metal gives out electrons, having larger kinetic energy, for the same wavelength of the incident radiation.
(iii) If the distance between the light source and metal X is halved, how will the kinetic energy of electrons emitted from it change? Give reason
(i) Let
= Frequency of incident radiations of metal Y
Therefore, metal X has larger threshold wavelength.
(ii) Since the kinetic energy of the emitted electrons is directly proportional to the frequency of incident radiation, metal Y having larger incident frequency will have larger kinetic energy.
∴ Metal Y has larger kinetic energy.
(iii) Kinetic energy of the emitted photoelectrons is independent of the intensity of the incident light. Hence, kinetic energy of the emitted photoelectrons remains unchanged if the distance between the light source and metal X is halved.
in this in (ii) part why work function.is not considered kindly reply fast... ??
The wavelength lambda , of a photon & the de-broglie wavelength of an electron have the same value.show that the energy of the photon is (2*lambda*m*c)/h times the kinetic energy of the electron, where m,c,h have their usual meanings..
explain the photovoltaic cells and photoconductive cells
The work function of caesium is 2.14eV.find a)threshold frequency.b) the wavelength of incident light if the photocurrent is brought to zero by a stopping potential of 0.60v
what is exact mening of " nature loves symmetry "in the defenition of dual nature matter???? pls explain.....
What is the shortest wavelength present in the Paschen series of spectral lines?
Given that photon of light of wavelength 10000 Ao has an energy equal to 1.23 eV. When a light of wavelength 5000Ao adn intnsity I falls on photoelectric cell, the surface current is 0.40 X 106 A. Stopping potential is 1.36eV, then what is the work function? (1 Ao = 10-10m)
state how in a photocell the work-function of the metal depend upon the kinetic energy of emitted electron.
define intensity of light?
why is quartz window used in experiment for photoelectric effect?
If the frequency of incident light on a metal surface is doubled for the same intensity . What is the change observed in Kinetic Energy of the photoelectrons emitted?
A proton is accelerated through a potential difference of 400 V to have same de-Broglie wavelength what potential difference must be applied across doubly ionised 8O16 atom :-
(1) 50 volt
(2) 12.5 volt
(3) 100 volt
(4) None of these
An electron and a photon each have a wavelength of 1.00 nm. Find
(a) their momenta,
(b) the energy of the photon, and
(c) the kinetic energy of electron.
When a given photosensitive material is irradiated with light of frequency V , the maximum speed of the emitted photoelectrons equals Vmax. The square of Vmax, i.e., Vmax2, is observed to vary with , as per the graph shown here. Obtain expressions
(i) Planck’s constant, and
(ii) The work function of the given
photosensitive material,
in terms of the parameters n and the mass, m, of the electron.
AN ELECTRON AND ALPHA PARTICLE HAVE THE SAME de-Broglie WAVE LENGTH ASSOCIATED WITH THEM .HOW ARE THEIR KINETIC ENERGIES RELATED ?
draw a graph showing the variation of de broglie wavelength of an electron with variation of its momentum
hertz and lenard's observations in photoelectric effect
An unpolarised light is incident on the boundary between two transport media.State the condition when the reflected wave is totally plane polarised. Find out the expression for the angle of incidence in this case.
if the same source is placed 0.6 m away from the photoelectric cell then find the new stopping potential and saturation current.
Can by increasing intensity of incident radiation, velocity of emitted photoelectrons be increased? Explain. What will be then the effect of increasing intensity?
why does the bluish color predominate in a clear sky
(b)= 927 deg cel
(c)= 327 deg cel
(d)= 54 deg cel
ans is 4.125eV and 3.585eV.
The stopping potential in an experiment on photo electric effect is 1.5V. What is the max K.E of the photo electrons emitted ?
what is SATURATION CURRENT????
Why wave nature of light fails to satisfy photoelectric effect....?
DERIVE EINSTEINS PHOTOELECTRIC EQUATION?
Light of frequency 1.5 times the threshold frequency is incident on a photo-sensitive material. if the frequency is halved and intensity is doubled,the photo current becomes?
light at a place is given as E = Eo sin (wt) which falls on a metal surface having work function W. calculate the max. K.E. of a photoelectron.
two metals A and b have work function 2eV and 4eV respectively which of the metals has a smaller threshold wavelenght? pls solve ftafat
How does the maximum kinetic energy of electrons emitted vary with the work function of the metal??
Q. A point source of monochromatic light of 1.0m.W is placed at a distance of 5.0 m from a metal surface. Light falls perpendicularly on the surface. Assume wave theory of light to hold and also that all the light falling on the circular area with radius = 1.0 x m (which is few times the diameter of an atom) is absorbed by a single electron on the surface. Calculate the time required by the electron on the surface. Calculate the time required by the electron to receive sufficient energy to come out of the metal if the work function of the metal is 2.0 eV.
An alpha particle after passing through a potential difference of 2 M V falls on a silver foil. The atomic number of silver is 47. Calculate (1) K.E. of alpha particle at a distance of 50 fm from the nucleus and (2) the shortest distance from the nucleus of silver to which the alpha particle reaches.
where is the question paper of last 5 years in this site thet was told by nitish ku gupta sir can u help me to find out
De-broglie wavelength associated with an electron accelerated through a potential difference V is lambda. , what will b its wavelength , when accelerating potential is increased to 4V.
Here, why cant we use the formula '' lambda= 1.22/root V '' and this formula is applicable in what type of quests.?
Explain giving reason in which case more number of electrons will be emitted.
the heisenbers uncertainity can be applied to :
a.electrons only
b.neutrons only
c.protons only
d.all material objects in motion
Why de broglie waves associated with a moving football are not visible?
In an experiment, a bulb of power 1000 W produces 1010 photons/second. The radiation belongs to a part of the spectrum called
γ-rays
X-rays
ultraviolet rays
microwaves
is it correct to say that we can know the kinetic energy of the electrons by stopping potential??
what if stopping potential is very high (larger that Kinetic Energy of electrons)...then also it will prevent electrons from going to the collector..but it will not give the correct value for kinetic energy of electrons..
Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?
X-rays r used to irradiated sodium & copper surface in two separate experiments & stopping potential determined. This stopping potential is
1.)equal in both case
2.)greater for sodium
3.)greater for copper
4.)infinite in both cases
ans it wid explanation. plzzzz ans soon.......
Define threshold frequency?
the extent of localisation of a particle is determined roughly by its de broglie wavelength.if an electron is localized within the nucleus (of size of about 10^-14m) of an atom, what is its energy?In the solution of this question wavelength is taken to be10^-14m. but i can't understand how size of nucleus is equal to wavelength?
Determine the de-Broglie wavelength of a proton whose kinetic is equal to rest mass energy of an electron (rest mass energy = m0c2 & mp = 1840me )
write einstien photoelectric equation and point any two characterstic property of photon on which this equation is based?
DERIVE EINSTEINS PHOTOELECTRIC EQUATION?
What is the
(a) momentum,
(b) speed, and
(c) de Broglie wavelength of an electron with kinetic energy of 120 eV.
what is velocity selector?
Can pair production take place in vaccum..?