Recent questions tagged ch12

Let $E_n=\large\frac{-1me^4}{8\in_0^2 n^2h^2}$ be the energy of the nth level of H- atom . If all the H- atoms are in the ground state and radiation of frequency $(E_2-E_1) /h$ falls on it ,

asked Jul 8, 2016 by meena.p

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The Balmer series for the H- atom can be observed

asked Jul 8, 2016 by meena.p

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The Bohr model for the Spectra of a H-atom

asked Jul 8, 2016 by meena.p

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Consider aiming a beam of free electron towards free protons. when they scatter , an electron and a proton cannot combine to produce a H-atom .

asked Jul 8, 2016 by meena.p

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An ionized H- molecules consists of an electron and two protons. The proton are separated by a small distance of the order of any strom .In the ground state ,

asked Jul 7, 2016 by meena.p

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A set of atoms in an excited state decays

asked Jul 7, 2016 by meena.p

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Two H atoms in the ground state collide inelastically . The maximum amount by which their combined kinetic energy is reduced is

asked Jul 7, 2016 by meena.p

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$O_2$ molecules consists of two oxygen atoms. In the molecule , nuclear force between the nuclei of the two atoms

asked Jul 7, 2016 by meena.p

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For the ground state, the electron in th H- atom has an angular momentum = h , according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible direction . In actuality this is not true.

asked Jul 7, 2016 by meena.p

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The Simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons . This is because

asked Jul 7, 2016 by meena.p

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The binding energy of a H-atom , considering an electron moving around a fixed nuclei is $B= \large\frac{-me^4}{8n^2\in_0 h^2}$If one decides to work in a frame of reference where the electron is at rest , the proton would be around it. By similar arguments, the binding energy would be , $B=\large\frac{-Me^4}{8n^2\in_0^2h^2}$ This last expression is not correct because ,

asked Jul 6, 2016 by meena.p

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Taking the Bohr radius as $a_0 = 53 \;pm, $ the radius of $Li^{++}$ ion in its ground state , on the basic of Bohr's model will be about

asked Jul 6, 2016 by meena.p

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The total energy of electron in the first electron state of hydrogen atom is about $-3.4\;ev$ What is the kinetic energy of electron in this state ?

asked Jul 6, 2016 by meena.p

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Is the average angle of deflection of $ \alpha$ particles by a thin gold foil predicted by Thomson's model much less , about the same or much greater than that predicted by Rutherford's atom model ?

asked Jul 6, 2016 by meena.p

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In accordance with the Bohr's model find the quantum number that characterizes the earth revolution around the sun in an earth orbit of radius $1.5 \times 10^{11}\;m$ with orbital speed $3 \times 10^4 \;ms^{-1}$

asked Jul 6, 2016 by meena.p

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A $12.5\;ev$ electron beam is used to bombard gaseous hydrogen at room temperature .What series of wave length will be emitted ?

asked Jul 6, 2016 by meena.p

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The radius of inner most electron orbit of a hydrogen atom is $5.3 \times 10^{-11}\;m $ what are the radii of $n=2$ and $n=3$ orbits?

asked Jul 6, 2016 by meena.p

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Using Bohr's model , calculate the orbital period of the electron in a hydrogen atom in the $n= 1,2$ and $3$ levels

asked Jul 6, 2016 by meena.p

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Using the Bohr's model , calculate the speed of the electron in a hydrogen atom in the $n= 1,2$ and 3 levels

asked Jul 6, 2016 by meena.p

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A hydrogen atom initially in the ground level absorbs a photon, which excites it to $n=4$ level. Determine the wave length and frequency of photon .

asked Jul 6, 2016 by meena.p

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The ground state energy of hydrogen atom is $-13.6 ev$ what are the kinetic and potential energies of the electron of the electron in this state ?

asked Jul 5, 2016 by meena.p

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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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What is the shortest wave length present in the paschen series of spectral lines ?

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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Find the lengths of medians of the triangle $ABC$ where $A(0,0,6),\:B(0,4,0)\:and\:C(6,0,0)$

asked May 11, 2014 by rvidyagovindarajan_1

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Three vertices of a parallelogram $ABCD$ are $A(3,-1,2),\:B(1,2,-4)\:and\:C(-1,1,2)$ Find the coordinates of the $4^{th}$ vertex $D$.

asked May 11, 2014 by rvidyagovindarajan_1

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Find the coordinates of the points which trisect the segment joining the points $P(4,2,-6)$ and $ Q(10,-16,6)$

asked May 8, 2014 by rvidyagovindarajan_1

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Using the section formula show that the points $A(2,-3,4),\:B(-1,2,1),\: C(0,\large\frac{1}{3}$$,2)$ are collinear.

asked May 8, 2014 by rvidyagovindarajan_1

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Find the ratio in which $YZ$ plane divides the segment formed by joining the points $(-2,4,7)$ and $(3,-5,8)$

asked May 6, 2014 by rvidyagovindarajan_1

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Given that $P(3,2,-4),\:Q(5,4,-6)\:\:and\:\:R(9,8,-10)$ are collinear. Find the ratio in which $Q$ divides $PR$

asked May 6, 2014 by rvidyagovindarajan_1

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Find the coordinates of the point which divides the line segment joining the points $(-2,3,5)$ and $(1,-4,6)$ in the ratio $2:3$ externally.

asked May 5, 2014 by rvidyagovindarajan_1

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Find the coordinates of the point which divides the line segment joining the points $(-2,3,5)$ and $(1,-4,6)$ in the ratio $2:3$ internally.

asked May 5, 2014 by rvidyagovindarajan_1

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Find the equation of the set of points $P$ the sum of whose distance from $(4,0,0)$ and $(-4,0,0)$ is equal to $10$

asked May 3, 2014 by rvidyagovindarajan_1

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Find the equation of the set of points which are equidiatant from the the points $(1,2,3)$ and $(3,2,-1)$

asked May 3, 2014 by rvidyagovindarajan_1

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Verify that $(-1,2,1),\:(1,-2,5),\:(4,-7,8)\:and\:(2,-3,4)$ are vertices of a parallelogram.

asked Apr 17, 2014 by rvidyagovindarajan_1

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Verify that $(0,7,10),\:(-1,6,6)\:and\:(-4,9,6)$ are vertices of a right angled triangle.

asked Apr 17, 2014 by rvidyagovindarajan_1

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Verify that $(0,7,-10),\:(1,6,-6)\:and\:(4,9,-6)$ are vertices of an isosceles triangle.

asked Apr 17, 2014 by rvidyagovindarajan_1

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