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 modern atomic theory was conceived by : w) Victor Grignard x) Daniel Rutherford y) Svante Arrhenius z) John Dalton
Last Answer : ANSWER: Z -- JOHN DALTON
Description : What did John Dalton atomic theory teach?
Last Answer : The five main points of John Dalton's atomic theory are asfollowed: · Elements are made of tiny particles called atoms. · Allatoms of a given element are identical. · The atoms of a ... , nor destroyed in the chemical process. A chemicalreaction simply changes the way atoms are grouped together.
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 : 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 : Answer: Victor de Broglie.
Last Answer : What do you mean by orbitals?
Description : Why is Dalton credited with proposing the first atomic theory if Democritus was talking about atoms almost 2200 years earlier?
Last Answer : What is the answer ?
Description : ‘Atomic theory’ of matter was given by (1) Avogadro (2) Dalton (3) Newton (4) Pascal
Last Answer : Dalton
Description : How does the Rutherford gold foil experiment correctly advance atomic theory away from the plum pudding model.?
Last Answer : Need answer
Description : How was Thomson's atomic theory different from Rutherford atomic theory?
Last Answer : According to Thomson's atomic theory, the mass of an atom wasspecial evenly throughout its volume. Errest Rutherford'sexperiment proved this wrong.
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 : Uncertainty principle was presented by a) Dirac b)De Broglie c) Shrodinger d) W. Heisenberg
Last Answer : d) W. Heisenberg
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 law of multiple proportions was proposed by [IIT 1992] (A) Lavoisier (B) Dalton (C) Proust (D) Gay-Lussac
Last Answer : (B) Dalton
Description : “Plum Pudding Model” for an atom was proposed by (a) Antoine Lavoisier (b) Robert Boyle (c) Ernest Rutherford (d) J. J. Thomson
Description : who was proposed the theory of sexual selection a)Charles Darwin b) Lamarck c) De varies d) Hackle
Last Answer : a)Charles Darwin
Description : Who proposed mutation theory a. J.B. Lamarck b. Charles Darwin c. Hugo de vries d. Mendel
Last Answer : c. Hugo de vries
Description : The theory of inheritance of acquired characters are proposed by a. J.B. Lamarck b. Charles Darwin c. Gregor Mendel d. Hugo De vries
Last Answer : b. Charles Darwin
Description : Who was an ancient philosopher that first proposed the atomic theory?
Last Answer : Leucippus (approx. 500 BC) and Democritus (approx. 460-370BC)
Description : Which of the following Greek philosophers proposed the first atomic theory around 400 B.C.? Was it w) Plato x) Archimedes y) Aristotle z) Democritus
Last Answer : ANSWER: D -- DEMOCRITUS
Description : Who among the following discovered electron? (1) J.J Thomson (2) Max Born (3) Antoine Lavoisier (4) Mendeleef
Last Answer : (1) J.J Thomson Explanation: Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
Description : Atomic themy of matter was given by – (1) Avogadro (2) Dalton (3) Newton (4) Pascal
Last Answer : (2) Dalton Explanation: Democritus first suggested the existence of the atom, but John Dalton (1766- 1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of ... and properties; and compounds are formed by a combination of two or more different kinds of atoms.
Last Answer : He is an English chemist , schoolteacher , meteorologist and physicist.
Last Answer : Born on September 6 , 18.
Last Answer : Died July 26 , 1844.
Last Answer : John Dalton was a citizen of England.
Last Answer : John Dalton lived to be 77 years old.
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 : Who developed the model of atomic structure? (1) Bohr and Rutherford (2) Volta (3) Alfred Nobel (4) Faraday
Last Answer : (1) Bohr and Rutherford Explanation: In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. Niels Bohr further developed Rutherford's nuclear atom ... support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
Description : Write the draw back of Rutherford Atomic Model.
Last Answer : Ans (1). He was unable to explain the stability of Atom. (2). He could not explain the line spectrum.
Description : Who developed the model of atomic structure ? (1) Bohr and Rutherford (2) Volta (3) Alfred Nobel (4) Faraday
Last Answer : Bohr and Rutherford
Description : The concept of electric field theory was introduced by: (a) Kepler (b) Newton (c) Dalton (d) Michael Faraday
Last Answer : (d) Michael Faraday
Description : Who proposed this concept “All motion is relative”? A. Albert Einstein (Answer) B. John Kepler C. Galileo Galilie D. None
Last Answer : A. Albert Einstein (Answer)
Description : The unit to measure the quantity of Ozone in atmosphere is? A. Dobson (Answer) B. Dalton C. Cuolomb D. none
Last Answer : A. Dobson (Answer)
Description : X-rays were discovered by -----? A. Wilhelm Conrad Roentgen (Answer) B. Thomson C. Ernest Rutherford D. Bacquerel
Last Answer : A. Wilhelm Conrad Roentgen (Answer)