Description : Uncertainty principle was presented by a) Dirac b)De Broglie c) Shrodinger d) W. Heisenberg
Last Answer : d) W. Heisenberg
Description : The product of uncertainties of two physical observables must be approximately equal to a)Coulomb’s constant K b) Rydberg’s constant R c)Planck’s constant d)All of the above
Last Answer : c)Planck’s constant
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 : 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 : The atomic spectra of hydrogen are explained by (a) Rutherford's model of the atom (b) Hund's rule of maximum multiplicity (c) Pauli's exclusion principle (d) Bohr's theory
Last Answer : Ans:(d)
Description : "Upthrust = Weight of the liquid displaced" is known as A. Bernoulli's Principle B. Archimedes' Principle C. Pascal's Law D. Coulomb's law
Last Answer : Archimedes' Principle
Description : The Principle of an alternating current generator is based on: a. Coulomb’s law b. Ampere’s law c. Faraday’s law d. Lenz’s law
Last Answer : a. Coulomb’s law
Description : Answer: Victor de Broglie.
Last Answer : What do you mean by orbitals?
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 : 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 : 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 : 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 : 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 : 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 : 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 : 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 concept of matter waves was introduced by a) Davisson and Germer b) de Broglie c) Einstein d) Schrodinger
Last Answer : b) de Broglie
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 : here are two types of diffraction Fresnel and __________. A. Michelson B. De Broglie C. Fraunhofer D. Huygens
Last Answer : C. Fraunhofer
Description : Which of the following scientists hypothesized that it would be possible for particles to have wave-like properties ? Was it: w) Planck x) Heisenberg y) Einstein z) de Broglie
Last Answer : ANSWER: Z -- DE BROGLIE
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 : Matter waves are (1) de Broglie waves (2) Electromagnetic waves (3) Transverse waves (4) Longitudinal waves
Last Answer : de Broglie waves
Description : The ability of Vibrio fischerito produce bioluminescence chemicals only when a certain population density has been reached is an example of A.Liebig's law of the minimum B.Shelford's law of tolerance C.quorum sensing D.Heisenberg's principle of uncertainty
Last Answer : C.quorum sensing
Description : “All the four quantum numbers of two electrons in an atom are not the same.” It is the law of — (1) Hund’s (2) Exclusion Principle of Pauli (3) Uncertainty Principle of Hiesenberg (4) Avogadro’s Law
Last Answer : Exclusion Principle of Pauli
Description : The path of the electron according to Niels Bohr’s theory was called what?
Last Answer : Answer: Orbit shell.
Description : According to Bohr's theory of hydrogen atom, the angular momentum of the electron in the fourth orbit is given by (a) h/2p (b) 4h/p (c) h/p (d) 2h/p
Description : According to Bohr's theory, an electron in one Bohr stationary orbit can go to a higher stationary orbit (a) By emission of electromagnetic radiation (b) Without any absorption ... absorption of any electromagnetic radiation (d) With absorption of electromagnetic radiation of a particular frequency
Description : The path of the electron according to Niels Bohr’s theory was?
Last Answer : Orbit (Shell)
Description : What about Bohr's atomic theory was partially correct and also refined by other scientists?
Last Answer : well an Austrian physicist named Erwin Schrodinger and Germanphysicist name Werner Heisenberg refined Bohr's conclusion that theexact path of an electron cannot be predicted , but there arecertain area in an ... are called electron clouds. The part that's right is thatthey can still move around.
Description : What was Niels Bohr's contribution to the atomic theory?
Last Answer : Two related questions (completed with answers) should be followed.Cf 'Related questions' in the link below this answer.
Description : According to Bohr’s theory, the fourth stationary orbit of electrons in the hydrogen atom is a) 4 (0.053 nm) b) 9 (0.053 nm) c) 16 (0.053 nm) d) 25(0.053 nm)
Last Answer : c) 16 (0.053 nm)
Description : In Bohr's theory of the atom, what force was responsible for holding the electrons in their orbit?
Last Answer : ANSWER: COULOMB FORCE or THE FORCE OF ATTRACTION BETWEEN THE PROTON (NUCLEUS) AND THE ELECTRON
Description : What is happening that contradicts the laws of nature?
Last Answer : Nothing is happening that contradicts the laws of nature.But sometimes things occur that we don't quite understandhow.Those might look like they're contradicting the laws of natureuntil We understand them.
Description : Which of the following is least likely an application of maintaining an attitude of professional skepticism? a. The auditor is alert to audit evidence that contradicts or brings into question the ... audit evidence to be able to draw reasonable conclusions on which to base the audit opinion.
Last Answer : In planning and performing an audit, the auditor assumes that management is dishonest.
Description : Shear strain energy theory is also known as (a) Coulomb’s theory (b) Distortion energy theory (c) Rankine theory (d) None
Last Answer : (b) Distortion energy theory
Description : Shear strain energy theory is also known as (a) Von Mises Theory (b) Coulomb’s theory (c) Rankine theory (d) None
Last Answer : (a) Von Mises Theory
Description : Maximum shear stress theory is also called as (a) Beltrami theory (b) Coulomb’s theory (c) Haigh theory (d) None
Last Answer : (b) Coulomb’s theory
Description : Coulomb's wedge theory assumes that (A) Back fill is dry, cohesionless, homogeneous and isotropic (B) Slip surface is the plane which passes through the heel of the wall (C) Position and direction of the resultant earth pressure are known (D) All the above
Last Answer : (D) All the above
Description : According to Coulomb's wedge theory, the active earth pressure slides the wedge (A) Down and outwards on a slip surface (B) Up and inwards on a slip surface (C) Horizontal upward and parallel to base (D) Horizontal inward and parallel to base
Last Answer : Answer: Option A
Description : Consider the following statements regarding Coulomb's theory of earth pressure: 1. It is based on wedge theory of earth pressure. 2. It assumes the wall surface to be rough. 3. It may or may not satisfy the static equilibrium condition ... 1, 2 & 3 (b) 1 & 2 only (c) 2 & 3 only (d) 1 & 3 only
Last Answer : (b) 1 & 2 only
Description : The statement that "maximum wavelength of radiation is inversely proportional to the temperature" is __________ law. (A) Stefan-Boltzmann’s (B) Planck's (C) Wien's displacement (D) None of these
Last Answer : (C) Wien's displacement
Description : Planck's distribution law is valid for __________ bodies. (A) Black (B) White (C) Coloured (D) All (A), (B) & (C)
Last Answer : (C) Coloured
Description : Which one gives the monochromatic emissive power for black body radiation? (A) Planck's law (B) Kirchhoff’s law (C) Wien's law (D) Stefan-Boltzmann law
Last Answer : (A) Planck's law
Description : Stefan's block body radiation law can also be derived from __________ law. (A) Kirchoff’s (B) Planck's (C) Fourier's (D) None of these
Last Answer : (B) Planck's
Description : The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium". This is __________ law. (A) Kirchoff’s (B) Planck's (C) Wien's displacement (D) Stefan-Boltzmann
Last Answer : (A) Kirchoff’s
Description : At Equilibrium, the radiation emitted must equal the radiation absorbed. a. Boyle’s Law b. Planck’s Law c. Kirchoff’s Law d. Joule’s Law
Last Answer : Kirchoff’s Law
Description : Kelvin-Planck’s law deals with A. conservation of work B. conservation of heat C. conversion of heat into work D. conversion of work into heat
Last Answer : Answer: C