Physics question and answers for July 01, 2023
- Q A hypothetical element positronium consists of an electron moving in space around a nucleus consisting a positron Using the Bohr s atomic model determine the first Bohr radius Positron is...
- Q 2 18 Bohr model is applied to singly ionized helium Het Consider the lines that lie in the visible region of the spectrum Which of the following transitions can give...
- Q The graph between wave number and angular frequency w is oil Wave no Angular o frequency w What Wave no 1 Angular frequency Angular frequency w n Wave no 1...
- Q The energy of an excited hydrogen atom is 3 4 eV The angular momentum of the electron is Take h 6 63 x 10 4 J s a 1 05...
- Q SolveLancer Test The energy of an electron in nth orbit in a hydrogen atom is E By what factor the energy E will be related to the original energy E...
- Q substance with the FCC lattice has density of 6200 kg m3 The molecular weight of that substance is 0 2 amu The atomic packing fraction of lattice will be OPTIONS...
- Q 1 Decreases Remains same newton metre of a relativistic charged particle increases it s specific charge 2 Increases 4 First decreases then increases Smallest unit of charge is
- Q 7 17 An electron tube was sealed off during manufacture at a pressure of 1 2 x 10 mm of mercury at 27 C Its volume is 100 cm The...
- Q 7 3 17 An electron tube was sealed off during manufacture at a pressure of 1 2 x 10 mm of mercury at 27 C Its volume is 100 cm...
- Q llion that proved the existence of De Broglie s matter waves The radius of hydrogen atom is 5 3 x 10 1 m Use uncertainty principle to estimate the minimum...
- Q In the given figure the energy levels of hydrogen atom have been shown along with some transitions marked A B C D and E The transitions A B and C...
- Q An electron m 9 109 10 31 kg is confined in a one dimensional well of width L 10 nm Choose the correct options Marks 2 determine uncertainty in velocity...
- Q The wavelength of emission of radiation is 3000 and the coefficient of spontaneous emission is 10 power12 s Given k 8 6x 10 5eV K or 1 38 X 10...
- Q Title An electron m confined in a one dimensional well of width L 10 nm Choose the correct options Marks 2 determine uncertainty in momentum OPTIONS 9 109 10 31...
- Q In a hydrogen like atom an electron is orbiting in a orbit having quantum numbern Its frequency of revolution is found to be 13 6 x 10 5 Hz Energy...
- Q Q 48 In a photoelectric experiment a monochromatic light is incident on the metal plate A It was observed that with V 5 volt the maximum kinetic energy of photoelectrons...
- Q Which of the following statement is correct A B At sunset or sunrise the sun s rays have to pass through a small distance in the atmosphere At sunset or...
- Q A doubly ionised Li atom is excited from its ground state n 1 to n 3 state The wavelengths of the spectral lines are given by 232 231 and 221...
- Q 3 In each situation of Column I a physical quantity related to orbiting electron in hydrogen like atom is given The terms Z and n given in Column II have...
- Q The electric potential between a proton and an electron given by V V In where ro is a constant Assumit ro Bohr s model to be applicable write variation of...
- Q Let us consider what happens in the case of Si or Ge crystal containing Natoms For Si the outermost orbit is the third orbit n 3 while for Ge it...
- Q Radiation coming from transitions n 2 to n 1 c hydrogen atoms fall on He ions in n 1 and n 2 states The possible transition of helium ions as...
- Q Na has an ionization energy of 5 14eV Cl has an electron affinity of 3 61eV NaCl crystal has a lattice constant of 0 563nm and a Madelung constant of...
- Q c In a singly ionized Helium atom the electron is in the third orbit A photon of energy 10 04eV knocks out the electron Calculate the stopping potential of the...
- Q 5 Calculate value of spherical harmonics for 1 2 and m 0 and report the values in a table for 0 0 40 80 120 160 200 240 280 320...
- Q Electromagnetic radiations of Antensity 1 W m strikes on the surface of a substance which reflect 80 incident radiation back into same medium The radiation pressure on the surface of...
- Q In hydrogen atom in its ground state the first Bohr orbit has a radius r When the ator is raised to one of its excited states the electron s orbital...
- Q spectrum To which part of electromagnetic radiation with 21 cm wavelength emitted by atomic hydrogen in interstellar space belongs Microwaves Radiowaves min se Gamma rays
- Q These rays lie in upper frequency range of electromagnetic spectrum The rays are produced in nuclear reactions and used in medicine to destroy cancer cells The rays are X rays...
- Q a State and explain Heisenberg s uncertainty principle Describe gamma ray microscope experiment b The lifetime of an atom in its excited state is 10 8 s Calculate the minimum...
- Q 12 The amount of heat needed to raise the temperature of 4 moles of a rigid diatomic gas from 0 C to 50 C when no work is done is...
- Q 27 If radius of the A1 nucleus is taken to be RAI then the radius of 125 Te nucleus is nearly 53 13 53 53 13 r 3 13 O...
- Q The nuclear radius of a nucleus with nucleon number 16 is 3 10 15 metre Then the nuclear radius of a nucleus with nucleon number 128 is Question Type Single...
- Q 19 20 3 13 6 eV 4 12 1 V 3 13 6 eV 4 12 1 eV The element which has a Ka x rays line of 19 ara...
- Q Given this information what equation would I use to find frequency I already know hkw to concert MT to Joules but I dont know which equation id use because V...
- Q An electromagnetic wave of intensity 30 W m is incident or a surface of area 2 m If the surface is perfectly absorbing then the amount of momentum transferred to...
- Q SolveLancer Test On what factors the impact parameter depend on when angle of scattering is 90 SolveLancer Test a Nuclear charge of the atom on which bombarding is taking place...
- Q Example 7 The average life time of an electron in an excited state of H atom is about 10 8 s How many revolutions does an electron in n 2...
- Q Consider the electronic energy level diagram of H atom Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labeled To C B OD...
- Q I just have a small query regarding the transition of electrons from one orbit to the other I understood that electrons releases energy when it goes to an upper orbit...
- Q Which of the following statements does not form a part of Bohr s model of a hydrogen atom 1 The energy of the electrons in the orbit is quantized 2...
- Q 7 What are the horizontal rows on the periodic table are called Ogroups O periods sections families 8 What are the vertical columns of the Periodic Table are called spectra...
- Q A helium ion of mass 4m and charge 2e is accelerated from rest through a potential difference in vacuum Its final speed will be 2e V m o for O...
- Q The statement outlines the Standard Model and its description of all visible matter The atomic nucleus consists of the sub atomic particles called protons and neutrons which contain up and...
- Q 9 Which atom contains exactly 18 protons O Sulfur O Hydrogen O Gold O Argon Back Next This form was created inside of West Canada Valley
- Q a The average mass of all the isotopes of the element b A measure of the density of that element c The mass of the most common isotope of that...
- Q An electron is approaching the speed of light due to an applied force on it Which of the following is true about the electron a Its charge will increase b...
- Q If the energy difference between the ground state of an atom and excited state is 4 4 x 10 19 J The wave length of photon required to produce this...
- Q The ratio of angular speed and tangential speed of electron in nth orbit of hydrogen atom is NCERT Pg 425 1 Inversely proportional to n 2 Directly proportional to n...
- Q An electron in a hydrogen atom makes a transition from n to n If the time period of electron in the initial state is eight times that in the final...
- Q The impulse imparted by an electromagnetic pulse of energy 1 5 x 10 2 joule when it falls normally on a perfectly reflecting surface is Only one correct answer A...
- Q Whenever a photon is emitted by hydrogen atom in Balmer series it is followed by another photon in Lyman series What wavelength does this later photon corresponds to a 103...
- Q Ionisation potential of hydrogen atom is 13 6 eV Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12 1 eV According to Bohr s...
- Q A hydrogen atom is in an excited state of principle quantum number n em ts a photon of wavelength A when it returns to the ground state The value of...
- Q NEET PHYSICS Q 70 The product of angular speed and tangential Q 70 speed of electron in n orbit of hydrogen atom is 1 Inversely proportional to n 2 Directly...
- Q wavelength of radiation emitted when the electron jumps from the excited state to the ground state is nearly 1 Rydberg is equal to RH O 303 O 202 O 103...
- Q The energy of an electron in an excited hydrogen atom is 3 4 eV The angular momentum of the electron in this state according to Bohr s theory is nearly...
- Q 12 Review What is the value of the de Broglie wavelength of an electron when it is accelerated from rest through a potential difference of 150 V Only one correct...
- Q 11 Review An electron in a hydrogen atom makes a transition from n N to n N The frequency of the electron in the final state is eight times that...
- Q The energy of an electron in the ground state of a hydrogen atom is 13 6 eV Suppose there is an electron in the first excited state n 2 It...
- Q Q No 1 View In English A source S is producing 1015 photons per second of wavelength 5000 A Another source S2 is producing 102 x 1015 photons per second...
- Q The recoil speed of a hydrogen atom after it emits a photon in going from n 5 state to n 1 state will b 1 4 17 m s mathongo...
- Q Calculate the energy difference between two energy levels if an electron jumps from 2nd excited state to 5th excited state and the length of the box is 0 760 nm...
- Q 1 a potential mo r2 where r is the distance from the origin Applying the Bohr model in this case the radius of the particle in its nth orbit in...
- Q rogen anion using the Bohr model we assume that its two electrons move in an orbit such that they are always on diametrically opposite sides of the nucleus With each...
- Q H 21 The magnitude of acceleration of the electron in the nth orbit of hydrogen atom is a and that of singly ionized helium atom is The ratio a a...
- Q Consider the ion Be treat it as a hydrogen like atom within the Bohr model having 4 protons and 5 neutrons a What is the ground state energy of the...
- Q 42 If potential energy of electron in ground state is considered to be zero in hydrogen atom Total energy of electron in second excited state is 1 1 5 eV...
- Q 40 19K converts to 18 Ar by positive B decay as well as electron capture Let Q values for the decay and electron capture be Q and Q respectively in...
- Q In NPN transistor 1010 electrons enter in emitter region in10 6 s If 2 electrons are lost in base region then collector current and current amplification factor B respectively are...
- Q 3 The ratio of magnetic dipole moment and angular momentum of the electron in a Li ion is 1 Proportional to the quantum number n 2 Half the specific charge...
- Q The electron is present in the 1 51 eV energy state for H atom The radius of orbit of electron in this orbit is about 0 53 2 38 1...
- Q In the diagram shown below two atomic transitions are shown If X 4000 and 500 nm then A will be nearly 444 nm 900 nm 222 nm 600 nm
- Q hr mi The ratio of the wavelength of first line of Lyman series ar first line of Paschen series is 5 27
- Q hr min The ratio of the wavelength of first line of Lyman series and first line of Paschen series is 5 27
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