Physics question and answers for July 01, 2023
- Q 100 The output X of the logic circuit shown in figure will be mo RAINEET 2013 A Be 101 a X A B b X A B c X A...
- Q 16 A double charged lithium atom is equivalent to hydrogen whose atomic number is 3 The wavelength of required radiation for emitting electron from first to third Bohr orbit in...
- Q A charge of mass m and charge q is accelerated from res in a uniform electric field of strength E The velocity acquired by it two second after released will...
- Q An electron of kinetic energy 100 eV collides with a stationary helium ion He in its ground state and excites it to a higher level After collision He ion emits...
- Q 10 An electron moves along a metal tube with a variable cross section as show in figure How will its velocity change when it approaches the neck of the tube...
- Q 4 When an a particle collides with a stationary lithium nucleus the following nuclear reaction may take place 4He 7Li 10B n If Q value of this reaction is E...
- Q 5 If an orbital electron of the hydrogen atom jumps from the ground state to a higher energy state its orbital speed reduces to half its initial value If the...
- Q A hydrogen like atom of atomic number Z is in excited state of quantum number 2n It can emit a maximum energy photon of 204 eV If it makes a...
- Q SolveLancer Test The exchange forces i Can be explained by classical theory ii Can be explained by only quantum mechanics iii sometimes results in the appearance of antiferromagnetics SolveLancer Tes...
- Q 5 Like angular momentum which of the following is quantised for electron in Bohr s model of H atom 1 Kinetic energy 3 Speed 2 Radius 4 Magnetic moment
- Q 3 a Two stable isotopes of lithium Li and Li have respective abundances of 7 5 and 92 5 These isotopes have masses 6 01512 u and 7 01600 u...
- Q A Bohr hydrogen atom at rest in free space undergoes a transition from the energy level n 2 to n 1 emitting a photon in the positive x direction Since...
- Q An electron of mass m and charge e accelerated from rest through a potential difference Vin vacuum The fina speed of electron will be O O O lev 2e V...
- Q 11 a By using the deBroglie relation derive the Bohr condition mur n for the angular momentum of an electron in a hydrogen atom b Use this expression to show...
- Q As per Pauling the radius of an a given crystal is inversely proportional to the effective nuclear charge Z Z Z 0 where o represents the screening constant The crystal...
- Q c 3 2x10 8 eV d 3 3x10 8 eV 3 Find the energy of photon in watt hour for electromagnetic waves of wavelengths 3000 of wi Given h 6...
- Q An electron of mass me has a speed un in the nth Bohr orbit of a hydrogen atom The normalized speed V is given as Vn un c 1 685...
- Q 4 A small mirror of area A and mass m is suspended in a vertical plane by means of a weightless string A beam of light of intensity I falls...
- Q A hydrogen atom at rest de excites from n 2 state to n 1 state if recoil of atom is not taken into account then the percentage error in momentum...
- Q Three photons coming from excited atomic hydrogen sample are observed their energies are 12 1 eV 10 2 eV and 1 9 eV These photons must come from a Single...
- Q Bohr s atom model assumes a The nucleus is of infinite mass and is at rest b Electrons in a quantized orbit will not radiate energ c Mass of electron...
- Q 82 The diagram shows the path of four a particles of the same energy being scattered by the nucleus of an atom simultaneously Which of these are is not physically...
- Q 2 A electron of mass m when accelerated through a potential difference V has de Broglie wavelength A The de Broglie wavelength associated with a proton of mass M accelerated...
- Q The ratio between acceleration of the electron in singly ionised helium atom and doubly ionised lithium atom 1 both in ground state is a c 8 27 b d 27...
- Q 62 The velocity of an electron in the second orbit of sodium atom is v The velocity of an electron in its fifth orbit will be a v 5 C...
- Q 3 Hydrogen atom emits blue light when it jumps from n 4 energy level to the n 2 level Which colour of light would the atom emit when it changes...
- Q 21 A double charged lithium atom is equivalent to hydrogen whose atomic number is 3 The wavelength of required radiation for emitting electron from first to third Bohr orbit in...
- Q 30 In a hypothetical Bohr hydrogen the mass of the electron is doubled The energy Eo and radius ro of the first orbit will be ao is the Bohr radius...
- Q hm r 6 In the Bohr s model of a hydrogen atom the centripetal force is furnished by the coulomb attraction between the proton and the electron If a is...
- Q 49 Assuming Bohr s model for Li atom the first excitation energy of ground state of Li atom is 1 10 2 eV 2 91 8 eV 3 13 6...
- Q 9 Which is the correct relation between de Broglie wavelength of an electron in the nth Bohr orbit and radius of the orbit R 1 n2 R 2 3 2...
- Q d 4687 8 If an a particle of mass m charge q and velocity v is incident on a nucleus of charge Q and mass m then the distance of...
- Q If energy required to remove one of the two electrons from He atom is 29 5 eV then what is the value of energy required to convert a helium atom...
- Q Let F be the frequency of second line of Lyman series and F be the frequency of first line of Balmer series then frequency of first line of Lyman series...
- Q In a hydrogen atom electron moves from second excited state to first excited state and then from first excited state to ground state The ratio of wavelengths is A 20...
- Q The ionisation potential of hydrogen atom is 13 6V Draw the energy level diagram showing four levels Calculate i the energy of the photon emitted when an electron falls from...
- Q As the n number of orbit increases the difference of energy between the consecutive energy levels 1 Remains the same 2 Increases 3 Decreases 4 Sometimes increases and sometimes decreases
- Q In which transition of a hydrogen atom photons of lowest frequency are emitted 1 n 4 to n 3 2 n 4 to n 2 3 n 2 to n...
- Q The wavelength of maximum energy released during an atomic explosion was 2 93 x 10 10 m Given that Wein s constant is 2 93 x 10 3 m K...
- Q An electron in a hydrogen atom makes a transition from first excited state to ground state The equivalent current due to circulating electron A increases 2 times C increases 8...
- Q Which of the following combinations should be selected for better tuning of an L C R circuit used for communication NEET Phase 2 2016 1 R 20 22 L 1...
- Q Define the distance of closest approach An a particle of kinetic energy K is bombarded on a thin gold foil The distance of the closest approach is r What will...
- Q Which of the following statements is wrong 1 De Broglie waves are probability waves 2 De Broglie wavelength of a moving particle is inversely proportional to its momentum 3 Wave...
- Q 18 Fill in the blanks a b c and d by observing the characters given in the table and choose the correct answer from the following options Fertilisation Vascular tissue...
- Q If m is mass of electron v its velocity r the radius of stationary circular orbit around a nucleus with charge Ze then from Bohr s first postulate the speed...
- Q The binding energy of deuteron H is 1 112 MeV per nucleon and an a particle H has a binding energy of 7 047 MeV per nucleon Then in the...
- Q Figure shows the results of an experiment involving photoelectric effect The graphs A B C D are related to the light beams having different wavelength Choose incorrect option Current I...
- Q When an electron in hydrogen atom is excited from its 4th to 5th stationary orbit the change in angular momentum of electron is Question Type Single Correct Type 1 4...
- Q According to the Bohr s atomic model the relation between principal quantum number n and radius of orbit r is Your Answer Arxn B rx C I X 1 n...
- Q 8 In hydrogen and hydrogen like atoms the ratio of difference of energies E4n E2n and E2n En varies with atomic number Z and principal quantum number n as Z...
- Q 25 In a hydrogen atom the electron is in nth excited state It comes down to first excited state by emitting ten different wavelengths The value of n is a...
- Q 4 Which of the following combinations should be selected for better tuning of an L C R circuit used for communication NEET Phase 2 2016 1 R 20 22 L...
- Q 36 The count rate of a radioactive sample falls from 4 0 x 10 s to 1 0 x 10 s in 20 hours What will be the count rate...
- Q Objective NCERT Phys 73 In accordance with the Bohr s model the quantum number that characterises the earthis revolution around the sun in an orbit of radus 1 5 x...
- Q Calculate the ratio of the population numbers N1 N2 for the two energy levels E2 and E1 when the material is at room temperature 400K and the difference between the...
- Q 10 3 A hydrogen atom contains one proton and one electron It may be assumed that the electron revolves in a circle of radius 0 53 angstrom 1 angstrom 10...
- Q The potential energy of particle of mass m varies as E for OSIS1 U x 0 for x 1 The de Broglie wavelength of the particle in the range 0...
- Q Two isotopes of a certain element have binding energies that differ by 5 03 MeV The isotope with the larger binding energy contains one more neutron than the other isotope...
- Q 1 The total energy of an electron in an atom in an orbit is 3 4 eV Its kinetic and potential Henergies are respectively 1 3 4 eV 3 4...
- Q 8 eV 1 2 eV 3 0 eV 4 1 eV The ratio of frequencies of incident photons in V2 the graph shown will be Kay 7 eV 4 3...
- Q For the given common emitter amplifier circuit Vin applied is 10 V and VBE 0 If VCE is 6 V then value of base current B and collector current Ic...
- Q The following reaction occurs in acidic aqueous solution H3 AsO4 Zn AsH3 Zn H3 AsO4 is a number O O of As is O C Reducing 5 O Oxidizing 5...
- Q The average and RMS value of voltage for square wave shown in figure 5 254 having peak value are 0 4 V 12 T 2 2V0 T 3 2 Figure...
- Q d 4 1 A moving hydrogen atom makes a head on collision with a stationary hydrogen atom Before collision both atoms are in ground state and after collision they move...
- Q B Three concentric spherical shells have radii a b and c a b c and have surface charge densities and o respectively IfVA VB and V denote the potentials of...
- Q a For what kinetic energy of a neutron will the associated de Broglie wavelength be 1 40x 10 0 m b Also find the de Broglie wavelength of a neutron...
- Q 39 An electron and a photon possess the same de Broglie wavelength If E and E respectively are the energies of electron and photon and v and care E their...
- Q 3 The excitation energy of a hydrogen like ion to its first excited state is 40 8 eV The energy needed to remove the electron from the ion in the...
- Q the correct statement 1 A particle at rest breaks into two particles of different masses They fly off in different directions Their de Broglie wavelength will be different 2 Density...
- Q A particle of mass m moves in a circular orbit in a centra potential field U r kr If Bohr s quantization conditions 1 kr 2 2 are applied radii...
- Q 24 A point source of electromagnetic an average power output of The maximum value of electric field at a distance 3 5 m from source will be 1 12 V...
- Q Quiz Bot Quize conductor 1 15 Certain substance emits only the wavelengths A1 A2 A3and 4 when it is at a high temp When this substance is at a colder...
- Q Before carrying out the test for the presence of starch in a leaf on exposure to sunlight the leaf is put into alcohol in a beaker and boiled over a...
- Q 4 The de Broglie wavelength of a neutron corresponding to root mean square speed at 927 C is 2 What will be the de Broglie wavelength of the neutron corresponding...
- Q 1 The wavelength for n 3 to n 2 transition of the hydrogen atom is 656 3 nm What are the wavelengths for this same transition in a positronium which...
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