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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.

a)4125 A c)3000 A

b)2062.5 A d)6000 A

Sir,plz explain Davisson Germer experiment?

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

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... ??What si the conclusion of Davisson and Germer experiment?

Define intensity of radiation on the basis of photon picture of light. Write its SI unit.

Plzz tell the answer pah...

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.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.

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

Q7. Find the retarding potential required to stop electron of the de Broglie wavelength 0.5 nm.

Hint : ${\mathrm{eV}}_{\mathrm{s}}=\frac{\mathrm{hc}}{\mathrm{\lambda}}$

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

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)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

define intensity of light?

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) 100 %

b) 50%

c) 41%

d) 73%

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.How does the maximum kinetic energy of electrons emitted vary with the work function of the metal??

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

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

why does the bluish color predominate in a clear sky

(b)= 927 deg cel

(c)= 327 deg cel

(d)= 54 deg cel

calculate the longest and shortest wavelengths present in paschen series.

^{–2}kg moving with a speed of 100 ms^{–1}. Hence show that the wave nature of matter is important at the atomic level but is not really relevant at the macroscopic level.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.

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

proper defination of saturation current and stopping potential?

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?

why is quartz window used in experiment for photoelectric effect?

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.

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?

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

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.?

^{16}eV, 1.9 eV) how to proceed with the sum pls explain.Q 183.Rock salt forms a cubic lattice with sides of each cube having a length of 5.63 $\stackrel{\xb0}{A}$. The least potential difference across which the electrons should be accelerated so that they are reflected strongly by dashed planes indicated by dashed lines is(1) 2.44 V (2) 5.44 V (3) 7.44 V (4) 9.18 V

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

Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?Define threshold frequency?Determine the de-Broglie wavelength of a proton whose kinetic is equal to rest mass energy of an electron (rest mass energy = m_{0}c^{2 }& m_{p}= 1840m_{e})Wavelength (in nm) 200 400 600 800 1000 1200

Photon Energy (in eV) 6.216 3.108 2.072 1.554 1.243 1.036

(Without doing any calculation/taking any reading), explain how one can use this data to draw an appropriate graph to infer

(i) photon energy corresponding to a wavelength of 100 nm.

(ii) the wavelength value (in nm) corresponding to a photon energy of 1 eV.

(iii) velocity of light assuming that the value of Plank’s constant is known.

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.how p=hv/c? plz explain

what is velocity selector?

Can pair production take place in vaccum..?