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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.

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... ??Sir,plz explain Davisson Germer experiment?

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?

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

What si the conclusion of Davisson and Germer experiment?

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)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.2...when the em radiations of frequency 410raise to power15 and 610rtp15 Hz fall on the same metal in different experiments the ratio of max kinetic energy of electron liberated is 1:3. The threshold frequency for the metal is ??

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

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

a) 100 %

b) 50%

c) 41%

d) 73%

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

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.

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

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

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

define intensity of light?

DERIVE EINSTEINS PHOTOELECTRIC EQUATION?

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 ?

1. explain how Einstein's photoelectric equation enables us to understand the :- a) linear dependence,of the maximum kinetic energy of the emitted electrons,on the frequency of the incident radiation. b) existence of a threshold frequency for a given photoemitter.

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

Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?if the same source is placed 0.6 m away from the photoelectric cell then find the new stopping potential and saturation current.

a)4125 A c)3000 A

b)2062.5 A d)6000 A

why does the bluish color predominate in a clear sky

(b)= 927 deg cel

(c)= 327 deg cel

(d)= 54 deg cel

Q.15. If the velocity of an electron is doubled, its de Broglie frequency will

(1) Be halved

(2) Remain same

(3) Be doubled

(4) Become four times

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 ?

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

sir in formula kmax = eVo why it is not only Kmax = Vo for maximum energy of electron

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?

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

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

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.

Q7. When a electron accelerated by potential difference U is bombarded on a specific metal, the emitted X-ray spectrum obtained is shown in Fig. If the potential difference is reduced to U/3, the correct spectrum is.

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.?

Work function of Na is 2.3 eV. Does Na show photoelectric emmision for light of wavelength 6800 x 10^{-10}? HOW??proper defination of saturation current and stopping potential?

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

hc= 12400 eVÅ)(1) 1 eV (2) 2 eV (3) $\frac{4}{3}$ eV (4) $\frac{2}{3}$ eV

Define threshold frequency?## A block of mass 10 kg is held at rest against a rough vertical wall (μ= 0.5 ) under the action a force F . The minimum value of F required for it is (g=10 ms-2)

pls explain properly162.6 N

89.7 N

42.7 N

95.2N

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})$\left(A\right)\frac{{\mathrm{\pi R}}^{2}\mathrm{I}}{c}\phantom{\rule{0ex}{0ex}}\left(B\right)\frac{\mathrm{\pi RHI}}{c}\phantom{\rule{0ex}{0ex}}\left(C\right)\frac{IRH}{2c}\phantom{\rule{0ex}{0ex}}\left(D\right)\frac{IRH}{c}$

At an airport, a person is made to walk through the door way of a metal detector, for security reasons. If the person is carrying anything made of metal, the metal detector emits sound. On what principle does this detector work.? Explain.

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..?

why is quartz window used in experiment for photoelectric effect?

_{0}_{,}ν_{0’}) respectively.(Given : ν_{0 }is lesser than ν_{0’}_{)}(i) Which one of the two metals A or B has higher work function?

(ii) What information do you get from slope of the graph?

(iii) What does the value of the intercept of graph A on the potential axis represents? (3