Description : Who hypothesized that it would be impossible to know the exact location and exact momentum of a particle at the same time? Was it: w) Heisenberg x) De Broglie y) Planck z) Schrodinger
Last Answer : ANSWER: A -- HEISENBERG
Description : Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick
Last Answer : ANSWER: W -- EINSTEIN
Description : The collision between a photon and a free electron was first explained by which of the following scientists? w) Einstein x) Heisenberg y) Compton z) Bohr
Last Answer : ANSWER: Y -- COMPTON
Description : Uncertainty principle was presented by a) Dirac b)De Broglie c) Shrodinger d) W. Heisenberg
Last Answer : d) W. Heisenberg
Description : The idea that we CANNOT know both the position and velocity of a subatomic particle at the same time was formulated by: w) Einstein x) Heisenberg y) Fermi z) Schroedinger
Last Answer : ANSWER: X -- HEISENBERG
Description : Which of the following scientists first determined the atomic number of an atom by use of X-rays? Is it: w) Millikan x) Planck y) Thompson z) Moseley
Last Answer : ANSWER: Z -- MOSELEY
Description : Which of the following scientists is responsible for the exclusion principle which states that two objects may NOT occupy the same space at the same time? Was it: w) Heisenberg x) Bohr y) Teller z) Pauli
Last Answer : ANSWER: Z -- PAULI
Description : The concept of matter waves was introduced by a) Davisson and Germer b) de Broglie c) Einstein d) Schrodinger
Last Answer : b) de Broglie
Description : The theory which ascribes wave-like properties to particles is called: w) general relativity x) quantum mechanics y) special relativity z) classical mechanics
Last Answer : ANSWER: X -- QUANTUM MECHANICS
Description : Which one of the following scientists regarded light as electromagnetic waves? a) Newton b) Galileo c) de Broglie d) Maxwell
Last Answer : d) Maxwell
Description : The concept that particles can behave like waves was given by a) Compton b) De-Broglie c) G.P. Thomson d) Germer
Last Answer : b) De-Broglie
Description : The wave nature of electrons was EXPERIMENTALLY verified by: w) Einstein x) Davisson and Germer y) Balmer z) Bohr.
Last Answer : ANSWER: X -- DAVISSON AND GERMER
Description : If kinetic energy of a proton is increased nine times the wavelength of the de - Broglie wave associated with it would become :-
Last Answer : If kinetic energy of a proton is increased nine times the wavelength of the de - Broglie wave associated with it ... (3)` times D. `(1)/(9)` times
Description : A colligative property depends on: w) chemical properties of particles in system x) physical properties of particles in system y) number of particles present in system z) all of the above
Last Answer : ANSWER: Y -- NUMBER OF PARTICLES PRESENT IN SYSTEM
Description : Which of the following events occurred first? (1) Albert Einstein propounded the General Theory of Relativity (2) Max Planck unveiled the Quantum Theory (3) Marconi first transmitted a wireless signal (4) Madame Marie Curie be-came the first woman Nobel Prize winner
Last Answer : (2) Max Planck unveiled the Quantum Theory Explanation: General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; ... woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
Description : To develop the correct mathematical description of the distribution of radiated energy of a blackbody with respect to wavelength for a given temperature, Planck found it necessary to assume that the molecular ... units or quanta y) radiant energy in a continuous form z) none of the above.
Last Answer : ANSWER: X -- RADIANT ENERGY IN DISCRETE UNITS OR QUANTA
Description : As a longitudinal wave moves through a medium, the particles of the medium: w) vibrate in a path parallel to the path of the wave x) vibrate in a path perpendicular to the path of the wave y) follow the wave along its entire path z) do not move
Last Answer : ANSWER: W -- VIBRATE IN A PATH PARALLEL TO THE PATH OF THE WAVE
Description : Which of the following events occurred first? (1) Albert Einstein propounded the General Theory of Relativity (2) Max Planck unveiled the Quantum Theory (3) Marconi first transmitted a wireless signal (4) Madame Marie Curie became the first woman Nobel Prize winner
Last Answer : (2) Max Planck unveiled the Quantum Theory Explanation: General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; ... transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner.
Description : Which of the following occurred first? (1) Albert Einstein propounded the General Theory of Relativity (2) Max Planck unveiled the Quantum Theory (3) Guglielmo Marconi sent out the first wireless signals (4) Wright Brothers successfully flew an aircraft
Last Answer : (3) Guglielmo Marconi sent out the first wireless signals Explanation: Guglielmo Marconi sent out the first wireless signals. In the early summer of 1895 and despite an intervening hill, ... a gun. The theory of relativity transformed theoretical physics and astronomy during the 20th century.
Description : Who among the following evolved the concept of relationship between mass and energy? (1) Einstein (2) Planck (3) Dalton (4) Rutherford
Last Answer : (1) Einstein Explanation: Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics.
Description : Electron was discovered by (1) Ernest Rutherford (2) Max Planck (3) Joseph Thomson (4) Albert Einstein
Last Answer : Joseph Thomson
Description : Which of the following events occurred first ? (1) Albert Einstein propounded the General Theory of Relativity (2) Max Planck unveiled the Quantum Theory (3) Marconi first tranmitted a wireless signal (4) Madame Marie Curie became the first woman Nobel Prize winner
Last Answer : Max Planck unveiled the Quantum Theory
Description : Which of the following occurred first ? (1) Albert Einstein propounded the General Theory of Relativity (2) Max Planck unveiled the Quantum Theory (3) Guglielmo Marconi sent out the first wireless signals (4) Wright Brothers successfully flew an aircraft
Last Answer : Guglielmo Marconi sent out the first wireless signals
Description : Who proposed first atomic theory? (1) E.Rutherford (2) De Broglie (3) John Dalton (4) D.I.Mendeleef
Last Answer : (3) John Dalton Explanation: Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
Description : Who proposed first atomic theory? (1) E. Rutherford (2) De Broglie (3) John Dalton (4) D. I. Mendeleev
Description : Which of the following scientists first stated the law of conservation of mass? Was it: w) Lavoisier x) Dalton y) Proust z) Boyle
Last Answer : ANSWER: W -- LAVOISIER
Description : Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie
Last Answer : ANSWER: Z -- MARIE CURIE
Description : The father of the atomic bomb is: w) Einstein x) Oppenheimer y) Faraday z) Strangelove
Last Answer : ANSWER: X -- OPPENHEIMER
Description : Albert Einstein received the Nobel prize in physics for his work on: w) gravitation x) relativity y) photoelectric effect z) Brownian motion
Last Answer : ANSWER: Y -- PHOTOELECTRIC EFFECT
Description : The gravitational constant for the universe was measured by which of the following? w) Kepler x) Einstein y) Newton z) Cavendish
Last Answer : ANSWER: Z -- CAVENDISH
Description : The idea that electrons revolved in orbits around the nucleus of an atom without radiating energy away from the atom was postulated by: w) Thompson x) Bohr y) Rutherford z) Einstein
Last Answer : ANSWER: X -- BOHR
Description : Who is known as the Father of the Atomic Bomb? w) Albert Einstein x) J. Robert Oppenheimer y) General Leslie Groves z) Edward Teller
Last Answer : ANSWER: X -- J. ROBERT OPPENHEIMER
Description : An electron , in a hydrogen-like atom, is in excited state. It has a total energy of -3.4 eV. Calculate (a) the kinetic energy and (b) the de Broglie
Last Answer : An electron , in a hydrogen-like atom, is in excited state. It has a total energy of -3.4 ... and (b) the de Broglie wavelength of the electron.
Description : Answer: Victor de Broglie.
Last Answer : What do you mean by orbitals?
Description : The de-Broglie wavelength of an electron moving in the nth Bohr orbit of radius ris given by
Last Answer : The de-Broglie wavelength of an electron moving in the nth Bohr orbit of radius ris given by A. `(2pir)/n` B. `npir` C. `(nr)/(2pi)` D. `(nr)/pi`
Description : The two paricles A and B have de Broglie wavelengths 1 nm and 5 nm respectively if mass of A is four times the mass of B, the ratio of kinetic energie
Last Answer : The two paricles A and B have de Broglie wavelengths 1 nm and 5 nm respectively if mass of A is four times the mass of ... : 4` C. `20 : 1` D. `5 : 4`
Description : If the total energy of an electron in a hydrogen atom in an exicted state is -3.4 eV , then the de- broglie wavelegth of the electron is :-
Last Answer : If the total energy of an electron in a hydrogen atom in an exicted state is -3.4 eV , then the de- broglie ... `5xx10^(-9)m` D. `9.3xx10^(-12)m`
Description : De Broglie equation is (a) h/mv = 1 (b) E1 – E2 = hv (c) C = 1v (d) n1 = 2d sin q
Last Answer : Ans:(a)
Description : The de Broglie equation is (a) h/mv = 1 (b) hv = E2 - E1 (c) n 1 = 2d sin (d) c = hv
Description : Bohr's theory of fixed orbits contradicts (a) Coulomb's law (b) Planck's theory (c) de Broglie relation (d) Uncertainty principle
Last Answer : Ans:(d)
Description : Matter waves are – (1) de Broglie waves (2) Electromagnetic waves (3) Transverse waves (4) Longitudinal waves
Last Answer : (1) de Broglie waves Explanation: In mechanics, matter waves or de Broglie waves reflects the wave-particle duality of matter. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
Description : First Atomic theory was proposed by? A. John Dalton (Answer) B. E.Rutherford C. De Broglie D. D.I.Mendeleef
Last Answer : A. John Dalton (Answer)
Description : Noble prize was awarded to De-Broglie for his work on particle nature of light in a) 1929 b) 1937 c) 1905 d) 1915
Last Answer : a) 1929
Description : here are two types of diffraction Fresnel and __________. A. Michelson B. De Broglie C. Fraunhofer D. Huygens
Last Answer : C. Fraunhofer
Description : Matter waves are (1) de Broglie waves (2) Electromagnetic waves (3) Transverse waves (4) Longitudinal waves
Last Answer : de Broglie waves
Description : What are the major constituents of typical fly ash particles generated from the combustion of coal? w) acidic and basic oxides x) trace elements y) unburned carbon z) sulfates and phosphates
Last Answer : ANSWER: W -- ACIDIC AND BASIC OXIDES
Description : Which class of solids could have London Forces the attractive forces between particles in crystal lattice positions? w) ionic x) covalent y) metallic z) molecular
Last Answer : ANSWER: Z -- MOLECULAR
Description : The 1936 Nobel Prize in chemistry was awarded to Peter J.W. Debye for his studies of: w) kinetic energy of colliding particles x) electron configuration y) dipole moments z) conformations of cyclohexane
Last Answer : ANSWER: Y -- DIPOLE MOMENTS
Description : Which of the following refers to the scattering of light by colloidal particles? w) Rutherford effect x) Tyndall effect (pron: tin-dahl) y) Thompson effect z) none of these
Last Answer : ANSWER: X -- TYNDALL EFFECT