Physics question and answers for July 01, 2023
- Q 37 Magnetic field at the centre of nucleus of the hydrogen like atoms atomic number Z due to the motion of electron in nth orbit is proportional to 73 b...
- Q Given below are densities of some solids and liquids Give rough estimates of the size of their atoms Substance Carbon diamond Gold Nitrogen liquid Lithium Fluorine liquid Atomic Mass u...
- Q 17 The allowed orbits for electron are those in which Electron does not radiate energy Electron radiate energy b c d Orbits are circular Orbits are spiral
- Q A moving neutron collides with a singly ionized stationary helium atom that is in ground state What should be the minimum speed of the moving neutron for the collision to...
- Q RADIUS TE PE KE OF H HYDROGEN LIKE ATOMS BOHR S ATOMIC MODEL JUMPING OF e An electron in the hydrogen atom jumps fr excited state to the ground state...
- Q Bohr model is applied to singly ionized helium He Consider the lines that lie in the visible region of the spectrum Which of the following transitions can give a photon...
- Q explain the highlighted part why curve for electron and a staight line for PROTON EXP LAIN ME THE REASON FOR THIS IN THE GRAPH OF QUESTI ON Given below are...
- Q For a certain hypothetical one electron atom the wavelength in A for the spectral lines for transitions originating at n P and terminating at 1 are given by where P...
- Q What is the correct equation for the solubility product when calcium phosphate is dissolved in water A Ksp Ca2 PO4 B Ksp 3Ca2 2PO4 C Ksp Ca PO4 D Kp...
- Q SolveLancer Test An electron is revolving in an nth orbit of radius r with velocity v Now if the radius is increased by 16 times of original and electron s...
- Q The work function of a photosensitive surface is 3 2 eV The wavele of the incident radiation for which the stopping potential is 3 V lies in th O Visible...
- Q A proton is fired from very far away towards a nucleus with charge Q 120e where e is the electronic charge It makes a closest approach of 10 fim to...
- Q A photon creates a pair of electron positron with equal kinetic energy Let kinetic energy of each particle is 0 29 MeV Then what should be energy of the photon...
- Q i The mass of a particle moving with velocity 5 x 106 m s has de Broglie wavelength associated with it to be 0 135 nm Calculate its mass i...
- Q An electron initially at rest falls through a potential difference of 16 V The De Broglie wavelength of the electron is nearl A 0 3 A B 3 A C...
- Q Q1 The radius of a Cu nucleus is measured to be 4 8 10 3 cm A The radius of a Mg nucleus can be estimated to be a 2...
- Q i In hydrogen atom an electron undergoes transition from second excited state to the first excited state and then to the ground state Identify the spectral series to which these...
- Q Calculate the three lowest energy levels in eV for an electron inside a one dimensional infinite potential well of width 2 Also determine the corresponding normalized eigenfunctions Given mass of...
- Q An electron with speed v and a photon with speed c have the same de Broglie wavelength If the kinetic energy and momentum of electrons is E and P and...
- Q A 12 5 eV electron beam is used to bombard gaseous hydrogen at room temperature Upto which energy level the hydrogen atoms would be excited Calculate the wavelengths of the...
- Q A doubly ionised lithium atom is hydrogen like atom with atomic number 3 The wavelength of radiations required to excite that electron from first to third orbit is nearly O...
- Q A resistor and an 26 In a photocell circuit the stopping potential Vo is a measure of the maximum kinetic energy of the photoelectrons The following graph shows experimentally measured...
- Q The energy of a hydrogen atom in the ground state is 13 6 eV The energy of a He ion in the first excited state will be 2010 a 13...
- Q A particle having zero rest mass and non zero energy and momentum must travel with a speed a equal to c the speed of light in vacuum b tending to...
- Q When an electron in hydrogen like atom jumps from a higher energy level to lower energy level O Angular momentum of the electron remains constant O Kinetic energy of electron...
- Q s it in the syllabus of neet 69 Nuclear Fission is best explained by Liquid drop model 2 Yukawa meson theory 3 Independent particle model of the nucleus 4 Proton...
- Q An election from various excited states of hydrogen atom emits radiation to come to the ground state Let A Ag be the de Broglie wavelength of the electron in the...
- Q es up 44 Three semi conductors are arranged in the increasing order of their energy gap as follows The correct arrangement is 1 Tellurium germanium silicon 2 Tellurium silicon germanium...
- Q An a particle of 5 MeV energy collides with a nucleus of uranium Z 92 at rest at a scattering angle of 180 The nearest distance upto which a particle...
- Q Monochromatic light of frequency 6 0 10 4 Hz is produced by a laser The power emitted is 2 x 10 w The number of photons emitted on the average...
- Q Q No 15 One mole of an ideal monoatomic gas at temperature To expands slowly according to the law gas is 1 2 3 Correct Answer 1 Your Answer 3...
- Q In a sample of hydrogen like atoms all of which are in ground state a photon beam containing photons of various energies of a band spectrum consisting of a single...
- Q Which of the following is correct Question Type Single Correct Type 1 Lyman series is a continuous spectrum 2 3 Paschen series is a line spectrum in the infrared Balmer...
- Q Consider a hydrogen like atom whose energy in nth excited state is given by 13 6 2 En when this excited atom makes a transition from an excited state to...
- Q The energy of a photon of sodium light 589 nm equals the band gap of a semiconducting material a Find the minimum energy E required to create a hole electron...
- Q 7 An electron microscope is used to look at an atom of 1 0 A diameter We desire a resoltuion of about 0 05 A The minimum energy of electron...
- Q circuit 1 the potential is the same everywhere 2 the p type side is at a higher potential than the n type side itonital 3 there is an electric field...
- Q The ground state energy of hydrogen atom is 13 6 eV If the electron jumps to the ground state from the 3rd excited state the wavelength of the emitted photon...
- Q Which level of the single ionized carbon hasothongo the same energy as the ground state energy of hydrogen atom mat thongo 1 1 2 6 nathongo 3 4 mathongo 4...
- Q Graph shows a hypothetical speed distribution for a sample of N gas dN dN particle for V Voi is rate of change of number of particles dV dV 0 with...
- Q 54 Suppose the potential energy between electron and ke proton at a distance r is given by U 3x3 Assuming Bohr s Model to be valid for this atom if...
- Q 7 The shortest wavelength of the Bracket series of a hydrogen like atom atomic number 2 is the same as the shortest wavelength of the Balmar series of hydrogen atom...
- Q Identify the incorrect statements a An electronic wave function must be symmetrical with respect to the interchange of any two electrons b y must remain unchanged when the spin and...
- Q 5 The maximum kinetic energy of an electron is E when the incident wavelength is To increase the maximum kinetic energy of the electron to 2E the incident wavelength must...
- Q avelength of matter waves is also determined by using kinetic energy as formula is h 2mE If you double the kinetic energy of a particle how does the deBroglie wavelength...
- Q PASSAGE Wavelength of matter waves is also determined by using kinetic energy as formula is h 2mE Choose the correct options Marks 2 The kinetic energy of an electron is...
- Q Consider a hypothetical atom having atomic number z 2 It has two electrons each having mass m Assume that both electrons always lie diametrically opposite and nucleus of atom contains...
- Q A proton of mass mp is moving with an initial velocity vo colliding with a helium atom of mass 4 mp at rest If the proton leaves the point of...
- Q spontaneously decays releasing a Helium nucleus in the 236 Th a This is an example of alpha decay resulting in 90 238 U A nucleus of Uranium 238 924 process...
- Q 1 If one takes into account finite mass of the proton the correction to the binding energy of the hydrogen atom is approximately Mass of proton 1 60x10 27 kg...
- Q The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1 6 x 10 16 s The frequency of revolution of the electron...
- Q Let Fpp Fpn and Fnn denote the nuclear force between proton proton proton neutron and neutron neutron pair respectively When separation is 1 fm O Fpp Fpn Fnn O Fpp...
- Q 16m 45 Every series of hydrogen spectrum has an upper and lower limit in wavelength The spectral series which has an upper limit of wavelength equal to 18752 is Rydberg...
- Q V is the frequency of the series limit of Lyman series V is the frequency of the first line of Lyman series and V3 is the frequency of the series...
- Q Q 6 Moderate 1 01 55 A hydrogen like atom of atomic numbe Z is in an excited state of quantum number 2n It can emit a maximum energy photon...
- Q The ionisation potential of hydrogen atom is 13 6 eV An electron in the ground state of a hydrogen atoms absorbs a photon of energy 12 75 eV How many...
- Q A heated plate 20 by 20 cm is inclined at an angle of 60 with the horizontal and placed in water Approximately constant heat flux conditions prevail with a mean...
- Q The Biding energy per nucleon of Li and He nuclei are 5 60 MeV and 7 06MeV respectively In the nuclear reaction Li H2He Q the value of energy Q...
- Q 34 What should be the ratio of minimum to maximum wavelength of radiation emitted by transition of an electron to ground state of Bohr s hydrogen atom in lymen series...
- Q 15 The energy levels of a hypothetical one atom are shown in figure below 0 eV 0 80 eV 1 45 eV 3 08 eV 5 30 eV 15 6...
- Q ASSAGE n electron m 9 109 10 31 kg is confined in a one dimensional infinite square well of width L 0 nm Choose the correct options Marks 2 determine...
- Q PASSAGE An electron m 9 109 10 31 kg is confined in a one dimensional infinite square well of width L 10 nm determine energy for first excited energy state...
- Q The kinetic energy of an electron is 5 eV Calculate the de Broglie wavelength associated with it h 6 6 x 10 34 Js m 9 1 x 10 1...
- Q a 15 Energy levels A B C of corresponding to increasing values of energy i e EA EB Ec If A A2 A3 are the wavelength of radiations corresponding to...
- Q electron m 9 109 10 31 kg is confined in a one dimensional infinite square well of width L ama determine energy for ground energy state OPTIONS 4 10 11...
- Q The first three spectral lines of H atom in the Balmer series are given A1 A2 A3 considering the Bohr atomic model the wave lengths of first and third spectral...
- Q 0 The vapour pressure of a pure liquid solvent X is decreased to 0 60 atm from 0 80 atm on addition of a non volatile substance Y The mole...
- Q 03 Suppose a hydrogen like atom whose ene 13 622 nth excited state is given by En When this excited atom makes a transition from excited state to ground state...
- Q 56 A proton is about 1840 times heavier than a electron When it is accelerated by a potenti difference of 1 kV its kinetic energy will be 1 1840 keV...
- Q Calculate the potential required to stop all the electrons when a light of wavelength 176 nm shines on a metal whose work function is 6 5 eV er a 0...
- Q Suppose frequency of emitted photon is fo when electron of a stationary hydrogen atom jumps from a higher state m to a lower state n If the atom is moving...
- Q If and 2 are respectively the wavelengths of the series limit of Lyman and Balmer series of Hydrogen atom then the wavelength of the first line of the Lyman series...
- Q 23 In the following atoms and molecules transition from n 2 to n 1 the spectr minimum wavelength will be produced by 1 Hydrogen atom 2 Deuterium atom 3 Unionized...
- Q The compound unstable nucleus 236U often decays in accordance with the following reaction U10 92 other particles In the nuclear reaction presented above the other particle might be Question Type...
- Q 3 3r If the de Broglie wavelength of a proton is 10m the electric potential through which it must have been accelerated is 1 4 07 10 V 2 8...
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