Recent questions in Dual nature of radiation and matter

<div>Explain the phenomenon of diffraction of light at a single slit to show the fringes of diffract

asked Jul 19, 2017 by pady_1

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<div>Explain polarisation by reflective. State and Prove Brewster's law.</div>

asked Jul 19, 2017 by pady_1

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Derive an expression for intensity at any point on the observation serem in the young’s double sli

asked Jul 19, 2017 by pady_1

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State Huygen's principle and also explain their propagation of waves

asked Jul 19, 2017 by pady_1

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A photo cell is illuminated by a source of light , which is placed at a distance d. If distance becomes $\large\frac{d}{2}$ then the number of electrons emitted per second will be

asked Jul 5, 2016 by meena.p

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Red light , how ever bright it is , cannot produce the emission of electrons from a clean zinc surface , But even weak ultra violet radiation can do so why ?

asked Jul 5, 2016 by meena.p

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An electron and a proton each have de-Broglie wave length of $1.00 nm$ . What is the ratio of their linear momenta

asked Jul 5, 2016 by meena.p

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The wave length of $1kev$ photon is $1.24 \times 10^{-9}\;m$. What is the frequency of $1Mev$ photon ?

asked Jul 5, 2016 by meena.p

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Three particles having charges in the ratio of $2:3:5$ produce the same point on the photographic film in Thomson experiment . Their masses are in the ratio of

asked Jul 5, 2016 by meena.p

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The potential difference that much be applied to stop the fastest photo electron emitted by a nickel surface having work function $5.01\;ev$ When ultra violet light 0f 200 nm falls on it , must be

asked Jul 5, 2016 by meena.p

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By photoelectric effect , Einstein proved

asked Jul 5, 2016 by meena.p

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If the kinetic of a particle is increased by 16 times , the percentage change in the de - Broglie wave length of the particle is

asked Jul 5, 2016 by meena.p

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What is the energy of a photon whose wave length is $6840 ^{\circ}A$

asked Jul 5, 2016 by meena.p

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A proton and an $\alpha$ particle are accelerated through a potential difference of $100\;v$ . The ratio of the wave length associated with the proton to that associated with an $\alpha$ particle is

asked Jul 5, 2016 by meena.p

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If the kinetic energy of a free electron doubles , its de-Broglie wave length charges by a factor ,

asked Jul 5, 2016 by meena.p

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The threshold wave length ,for photo electric emission from a material is $5200 A^{\circ}$ photo electron will be emitted when this material is illuminated with monochromatic radiation from a

asked Jul 5, 2016 by meena.p

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The maximum Kinetic energy of photo electron emitted from a surface when photons of energy $6ev$ fall on it is $4ev$. the stopping potential in volt is

asked Jul 5, 2016 by meena.p

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What is the momentum of a photon from ultra violet light of wave length $ \lambda= 332 \;nm$

asked Jul 4, 2016 by meena.p

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Find the ratio of de-Broglie wave lengths associated with two electrons beams , accelerated through $25V$ and $36V$ respectively

asked Jul 4, 2016 by meena.p

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What is the value of stopping potential between the cathode and the anode of a photocell , if the maximum kinetic energy of the electron emitted is $5ev$

asked Jul 4, 2016 by meena.p

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What is the energy of a photon in ev corresponding to the visible light of maximum wave length ?

asked Jul 4, 2016 by meena.p

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What is the momentum of photon of energy 3 Mev in $kgms^{-1}$?

asked Jul 4, 2016 by meena.p

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Find the de-Broglie wave length associated with an electron moving with velocity $0.6 \;C$ given , rest mass of electron $= 9.1 \times 10^{-31} \;kg$

asked Jul 4, 2016 by meena.p

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A photon and an electron both have energy of 100 ev . Which has greater wave length ?

asked Jul 4, 2016 by meena.p

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A neutron beam of energy E scatters from atoms on a surface with a spacing $d= 0.1 nm$ . The first maximum of initially in the reflected beam occurs at $ \theta= 30^{\circ}$ . What is the kinetic energy E of the beam in eV?

asked Jul 4, 2016 by meena.p

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Two monochromatic beams A and B of equal intensity I , hit a screen . The number of photons hitting the screen by beam A is twice that by beam B. Then What inference can you make about their frequencies ?

asked Jul 4, 2016 by meena.p

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There are two sources of light each emitting with a power of 100 w. one emits X- rays of wave length 1 nm and the other visible light at 500 nm. Find the radio of no of photons of x- rays to the photons of visible light of the given wave length ?

asked Jul 4, 2016 by meena.p

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Do all the electrons that absorb a photon come out as photo electrons ?

asked Jul 4, 2016 by meena.p

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In the explanation of photo electric effect , we assume one photon of frequency $\alpha$ collide with an electron and transfer its energy . This leads to the equation for the maximum energy $E_{max}$ of the emitted electron as $ E_{max}= h \alpha - \phi _0$ where $ \phi _0$ is the work function of the metal. If an electron absorbs 2 photons (each of frequency ) what will be the maximum energy for the emitted electron ?

asked Jul 4, 2016 by meena.p

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A proton and an $\alpha $ particle are accelerated , using the same potential difference . How are the de- Broglie wave length $ \lambda_p$ and $\lambda_{\alpha}$ related to each other ?

asked Jul 4, 2016 by meena.p

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A particle moves in a closed orbit around the orgin . The de- Broglie wave length of the particle varies cyclically between two values $ \lambda_1 , \lambda_2$ with $ \lambda_1 > \lambda_2$ Which of the following statements are true ?

asked Jul 4, 2016 by meena.p

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Photons absorbed in matter are converted to heat , A source emitting n photons/ sec of frequency $\gamma$ is used to convert $1 kg$ of ice at $ 0^{\circ}C$ to water at $ 0^{\circ}C$ . Then , the time taken for the conversion .

asked Jul 4, 2016 by meena.p

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The de- Broglie wave length of a photon is twice the de- Broglie wave length of an electron. The speed of the electron is $v_e = \large\frac{c}{100}$ . Then

asked Jul 4, 2016 by meena.p

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Two particles $A_1$ and $A_2$ of masses $m_1$ and $m_2 (m_1 > m_2)$ have the same de -broglie wave length then

asked Jul 4, 2016 by meena.p

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Relativistic correction become necessary when the expression for the kinetic energy $\large\frac{1}{2}$$mv^2$ becomes comparable with $mc^2$ where m is the mass of the particle . At what de- broglie wave length will relativistic correction become important for an electron ?

asked Jul 4, 2016 by meena.p

1 answer

An electron (mass m) with an initial velocity $ \overrightarrow{v} =v_0 \hat i$ is in an electric field $ \overrightarrow{E} = E_0 \hat j$. If $\lambda_0 = \large\frac{h}{mv_0}$ , Its de-Broglie wave length at time t is given by

asked Jul 4, 2016 by meena.p

1 answer

An electron (mass m) with an initial velocity $ \overrightarrow{v} =v_0 \hat i (v_0 > 0) $ is in an electric field $ \overrightarrow{E} =- E_0 \hat i (E_0= constant >0) $ . Its de-Broglie wave length at time t is given by

asked Jul 4, 2016 by meena.p

1 answer

An electron is moving with an initial velocity $\overrightarrow{v} =v_0 \hat i $ and is in a magnetic field $\overrightarrow{B}= B_o \hat j$ Then its de -Broglie wave length

asked Jul 4, 2016 by meena.p

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A Proton , a neutron , an electron and an $\alpha$ particle have same energy.Then their de Broglie wave length compare as :

asked Jul 4, 2016 by meena.p

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Consider beam of electron (each electron with energy $E_0$ ) incident on a metal surface kept in an evaluated chamber. Then

asked Jun 30, 2016 by meena.p

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The wave length of a photon needed to remove a proton from a nucleus which is bound to the nucleas with 1 Mev energy is nearly

asked Jun 30, 2016 by meena.p

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A particle is dropped from a height H. The de-Broglie wave length of the particle as a function of height is proportional to

asked Jun 30, 2016 by meena.p

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The energy and momentum of an electron are related to the frequency and wave length of the associated matter wave by the relation $E= h \gamma,P=\large\frac{h}{\lambda}$ But while the value of $\lambda $ is physically significant the value of $\gamma$ (and therefore the value of phone speed ) has no physical significance why ?

asked Jun 30, 2016 by meena.p

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Every metal has a definite work function. Why do all photo electrons not come out with the same energy if incident radiation is monochromatic ? why there an energy distribution of photo electron ?

asked Jun 30, 2016 by meena.p

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Why should gases be insulators at ordinary pressures, and start conducting at low pressures.

asked Jun 30, 2016 by meena.p

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What is so special about the combination e/m ? Why do we not simply talk of e and m separately ?

asked Jun 29, 2016 by meena.p

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Quarks inside protons and neutrons are through to carry factional charges $\bigg[+\bigg( \large\frac{2}{3}\bigg):\bigg( \large\frac{-1}{3}e\bigg)\bigg]$ why do they not show up in Millikan's oil-drop experiment ?

asked Jun 29, 2016 by meena.p

1 answer

Compute the typical de-Broglie wave length of an electron in a metal at $27^{\circ}$ C and compare it with the mean separation between two electron in a metal which given to be about $2 \times 10^{-10}\;m$

asked Jun 29, 2016 by meena.p

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Find the typical de- Broglie wave length associated with a Helium gas at room temperature $(27^{\circ})$ and latm pressure, and compare it with the mean separation between two atoms under there conditions .

asked Jun 29, 2016 by meena.p

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The wave length of an probe is volubly a measure of the size of a structure that it can probe in some detail. The quark structure of protons and neutrons appear at the last minute length - scale of $10^{-5}\;m$ or less. This structure was first probed in early 1970's using high energy electron beam produced by a linear acceleration at stanford USA. guess what might have been the order of energy of these electron beams . (Rest mass energy of electron $=0.511\; Mev$)

asked Jun 29, 2016 by meena.p

1 answer

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