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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.

Sir,plz explain Davisson Germer experiment?

What si the conclusion of Davisson and Germer experiment?

write the laws of photoelectric effect by using Einstein's photo electric equations.

_{1}→ n_{2}where n_{1}and n_{2}are the principal quantum numbers of two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that is in the final stage. The possible values of n_{1}& n_{2}are(A) n

_{1}= 4, n_{2}= 2 (B) n_{1}= 8, n_{2}= 2 (C) n_{1}= 8, n_{2}= 1 (D) n_{1}= 6, n_{2}= 3Define intensity of radiation on the basis of photon picture of light. Write its SI unit.

Plzz tell the answer pah...

explain the photovoltaic cells and photoconductive cells

What is the shortest wavelength present in the Paschen series of spectral lines?

The following graph shows the variation of stopping potential

V_{0}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... ??define intensity of light?

^{16}eV, 1.9 eV) how to proceed with the sum pls explain.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.AN ELECTRON AND ALPHA PARTICLE HAVE THE SAME de-Broglie WAVE LENGTH ASSOCIATED WITH THEM .HOW ARE THEIR KINETIC ENERGIES RELATED ?

Given that photon of light of wavelength 10000 A

^{o}has an energy equal to 1.23 eV. When a light of wavelength 5000A^{o}adn intnsity I falls on photoelectric cell, the surface current is 0.40 X 10^{6}A. Stopping potential is 1.36eV, then what is the work function? (1 A^{o }=^{ }10^{-10}m)of light incident on the surface changes from lambda1 to lambda2. Derive the expressions for the

threshold wavelength lambda

_{o}and work function for the metal surface.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?

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

draw a graph showing the variation of de broglie wavelength of an electron with variation of its momentum

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..

if the same source is placed 0.6 m away from the photoelectric cell then find the new stopping potential and saturation current.

hertz and lenard's observations in photoelectric effect

Q.11. A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo electron is

(1) 4.81 V

(2) 3.74 V

(3) 2.65 V

(4) 1.07 V

why does the bluish color predominate in a clear sky

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.

Why wave nature of light fails to satisfy photoelectric effect....?

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?

The stopping potential in an experiment on photo electric effect is 1.5V. What is the max K.E of the photo electrons emitted ?

(b)= 927 deg cel

(c)= 327 deg cel

(d)= 54 deg cel

DERIVE EINSTEINS PHOTOELECTRIC EQUATION?

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.

two metals A and b have work function 2eV and 4eV respectively which of the metals has a smaller threshold wavelenght? pls solve ftafat

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.

Why de broglie waves associated with a moving football are not visible?

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.?

Define threshold frequency?Show the variation of the photo current with collector plate potential for different intensities but same frequency of incident radiation.

Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?How does the maximum kinetic energy of electrons emitted vary with the work function of the metal??

Can pair production take place in vaccum..?

What is the

(a)momentum,(b)speed, and(c)de Broglie wavelength of an electron with kinetic energy of 120 eV.11.Two isotopes P and Q of atomic weight 10 and 20, respectively are mixed in equal amount by weight. After 20 days their weight ratio is found to be 1 : 4. Isotope P has a half-life of 10 days. The half-life of isotope Q is(1) Zero (2) 5 days (3) 20 days (4) infinite

what is velocity selector?

an alpha particle having kinetic energy of 7.68mev is projected towards the nucleus of copper z=29 . calculate its distance of closest approach

^{11}C/kg the maximum velocity of the ejected electron isDERIVE EINSTEINS PHOTOELECTRIC EQUATION?

Calculate the

(a)momentum, and(b)de Broglie wavelength of the electrons accelerated through a potential difference of 56 V.formula for stopping potential?

have same energy E. What is the ratio of their wavelenght?

3. Why GaAs is better than Si for making solar cells?

Explain giving reason in which case more number of electrons will be emitted.

Work function of Na is 2.3 eV. Does Na show photoelectric emmision for light of wavelength 6800 x 10^{-10}? HOW??an electron,proton and an alpha particle have the same kinetic energy.which of these particles hae the shortest de-broglie wavelength?

a) write the relative magnetic permeability of these materials.

write einstien photoelectric equation and point any two characterstic property of photon on which this equation is based?