Recent questions tagged easy

A difference of $2.3 \;ev$ separates two energy levels in an atom. What is the frequency of radiation emitted when the atom transmit from the upper level to the lower level .

asked Jul 5, 2016 by meena.p

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Suppose you are given a chance to repeat the alpha particle scattering experiment using a thin sheet of solid hydrogen in place of gold foil (hydrogen is a solid at temperature below 14 k) What results do you except ?

asked Jul 5, 2016 by meena.p

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The positively charged part of the atom possesses most of the mass of the atom in __________

asked Jul 5, 2016 by meena.p

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An atom has a nearly continuous mass distribution in but has a highly non uniform mass distribution in ____

asked Jul 5, 2016 by meena.p

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A classical atom based on _________ is doomed to collapse

asked Jul 5, 2016 by meena.p

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In the ground state of __ electrons are in stable equilibrium , while in electrons always experience a net force

asked Jul 5, 2016 by meena.p

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The size of the atom in Thomson's model is __________ the atomic size in Rutherford's model

asked Jul 5, 2016 by meena.p

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

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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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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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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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

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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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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

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An election micro scope uses electrons accelerated by a voltage of 50 kv. Determined the de-Broglie wave length associated with the electrons. If other factor (such as numerical aperture ) are taken to be roughly the same, how does the resolving power of an electron microscope that uses yellow light ?

asked Jun 28, 2016 by meena.p

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Obtain the de-Broglie wave length associated with thermal neutrons at room temperature $27^{\circ}$ Hence explain why a fast neutron beam needs to be thermalised with the environment before it can be used for neutron diffraction experiments.

asked Jun 28, 2016 by meena.p

1 answer

Obtain the de- Broglies wave length of a neutron of kinetic energy $150\;ev$ would a neutron beam of same energy be equally suitable for crystal diffraction experiments ? Explain given $m_n= 1.6 \pi \times 10^{-27}\;kg$

asked Jun 28, 2016 by meena.p

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The work function for the following metals is given $Ni: 5.15 \; ev$ What happen if the laser is brought never and placed 50 cm away ?

asked Jun 28, 2016 by meena.p

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The work function for the following metals is given $Na: 2.75 \; ev,k=2.30 \;ev ,Mo:4.17\;ev,Ni:5.15\;ev$ which of these metal will not give photo electric emission for a radiation of wave length , $3300 A^{\circ}$ from a He - cd laser placed 1 m away from the photo cell ?

asked Jun 28, 2016 by meena.p

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In an acceleration experiment on high energy collision of electrons with position , a certain event is interpreted as annihilation of an electron position pair of total energy $10.2\;Bev$ into two $\gamma$ rays of equal energy. What is the wave length associated with each $\gamma$- ray $(1Bev= 10^9\;ev)$ ?

asked Jun 27, 2016 by meena.p

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An x-ray tube produces a continuous spectrum of radiation with its short wave length end at $0.45 A^{\circ}$ give what order of accelerating voltage (for electron ) is required in such a tube .

asked Jun 27, 2016 by meena.p

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Estimate the speed with which electron emitted from a heated cathode of an evacuated tube impinge on the anode maintained at a potential difference of $500\;v$ , with respect to the cathode . Ignore the small initial speeds of the electrons . The specific charge of the electron (ie) its $\large\frac{e}{m}$ is given to be $1.76 \times 10^{11}\;kg^{-1}$

asked Jun 24, 2016 by meena.p

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Find the de-Broglie wavelength of a neutron , in thermal equilibrium with matter, having an average kinetic energy of $ \large\frac{3}{2}$$kT$ at $300k$ .given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$

asked Jun 23, 2016 by meena.p

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For what kinetic energy of a neutron will the associated de-Broglie wave length be $1.40 \times 10^{-10}\;m$ given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$

asked Jun 23, 2016 by meena.p

1 answer

An electron and a photon each have a wave length of $1.00\;nm$ calculate the kinetic energy of the electron .given $h= 6.63 \times 10^{-34}\;Js,m_e= 9 \times 10^{-31}\;kg$

asked Jun 23, 2016 by meena.p

1 answer

An electron and a photon each have a wave length of $1.00\;nm$ calculate the energy of the photon. $h= 6.6 \times 10^{-34}\;Js,m_e= 9 \times 10^{-31}\;kg$

asked Jun 23, 2016 by meena.p

1 answer

An electron and a photon each have a wave length of $1.0\;nm$ . Find their momentum. $(h= 6.6 \times 10^{-34}\;Js)$

asked Jun 23, 2016 by meena.p

1 answer

What is the de-Breglie wave length of a dust particle of mass $1.0 \times 10^{-9}\;kg$ drifting with a speed of $2.2ms^{-1}$? $(h= 6.6 \times 10^{-34}\;Js)$

asked Jun 23, 2016 by meena.p

1 answer

What is the de-Broglie wave length of a ball of mass $0.060\;kg$ moving at a speed of $1.0ms^{-1} $?

asked Jun 23, 2016 by meena.p

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The wave length of light from the spectral emission line of sodium is $589\;nm$ . Find the kinetic energy at which a neutrals would have the same de - Broglie wavelength . given $(h= 6.6 \times 10^{-34}\;Js, mn=1.66 \times 10^{-27}\;kg)$

asked Jun 23, 2016 by meena.p

1 answer

The wave length of light from the spectral emission line of sodium is $589\;nm$ . Find the kinetic energy at which an electron would have the same de- Brojlie wavelength . given $(h= 6.6 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; m_n =1.66 \times 10^{27}\;kg)$

asked Jun 23, 2016 by meena.p

1 answer

What is the de- Broglie wave length of an electron with kinetic energy of $120 ev$ given $(h= 6.63 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; lev =1.6 \times 10^{-19}\;J)$

asked Jun 23, 2016 by meena.p

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What is the speed of an electron with kinetic energy of $120\;eV$ given $h= 6.63 \times 10^{-34} \;Js, \;m_e= 9 \times 10^{-31} kg,lev= 1.6 \times 10^{-19}\;J$

asked Jun 23, 2016 by meena.p

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