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

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
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ANSWER: Z -- MOSELEY
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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

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Last Answer : ANSWER: Z -- DE BROGLIE

Which of the following scientists explained the photoelectric effect? Was it: w) Einstein x) Planck y) Bohr z) Chadwick

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In the Millikan oil-drop experiment the UPWARD force on the drop is due to the: w) gravitational and electric fields x) gravitational field and the charge on the drop y) electric field and the size of the drop z) electric field and the charge on the drop

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Last Answer : ANSWER: Z -- ELECTRIC FIELD AND THE CHARGE ON THE DROP 

The Millikan experiment showed that electric charge was: w) negative x) quantized y) positive z) unmeasurable

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Last Answer : ANSWER: A -- HEISENBERG

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 oscillators of the blackbody emitted and absorbed: w) no radiant energy x) radiant energy in discrete units or quanta y) radiant energy in a continuous form z) none of the above.

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

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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

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Gamma rays are similar to X rays in which of the following ways? w) they have neither rest mass nor charge x) they can be bent in an electric field y) they originate within the nucleus z) they are of low energy

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A compound which contains two ring structures havi one common carbon atom is known as a: w) spiro-compound x) nonpolar compound y) interstitial compound z) inner compound

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Which of the following describes the orientation of bonds in an sp3 hybridized atom? w)triagonal x)linear y)tetrahedral z)planar

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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

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Who was the first American chemist to receive a Nobel Prize? He was selected in 1914 for his precise determination of atomic weights. w) Edward Frankland x) Theodore Richards y) John Bardeen z) Paul Dirac

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Modern periodic law had been given by (1) Moseley (2) Mendeleev (3) Lother-Mayer (4) Lavoisier

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Which of the following has the smallest atomic radius? w) iodine x) chlorine y) fluorine z) bromine

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Of the following elements which has the largest atomic radius? w) Ba x) F y) C z) Be

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Solids may be considered to be either crystalline noncrystalline. The basic difference between them is that a crystal, in contrast to a noncrystal: w) has a sharp melting point x) has an irregular array of atoms y) exhibits double refraction z) has a completely regular atomic or molecular structure

Description : Solids may be considered to be either crystalline noncrystalline. The basic difference between them is that a crystal, in contrast to a noncrystal: w) has a sharp melting point x) has an irregular array of atoms y) exhibits double refraction z) has a completely regular atomic or molecular structure

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Which of the following four elements has the largest atomic radius? Is it: w) strontium x) francium y) calcium z) bromine

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As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density

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The halogen with the largest atomic radius is: w) Cl x) I y) Br z) At

Description : The halogen with the largest atomic radius is: w) Cl x) I y) Br z) At

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The internal structure of crystals was first studied with which of the following? w) x-rays x) isotopes y) electron microscopes z) lasers

Description : The internal structure of crystals was first studied with which of the following? w) x-rays x) isotopes y) electron microscopes z) lasers

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Infrared rays are absorbed best by which one of the following. Is it: w) bodies of air x) white bodies with rough surfaces y) mirrors z) black bodies with rough surfaces

Description : Infrared rays are absorbed best by which one of the following. Is it: w) bodies of air x) white bodies with rough surfaces y) mirrors z) black bodies with rough surfaces

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Refracting telescopes, if uncorrected, suffer from chromatic aberration. Chromatic aberration occurs because: w) red light is focused more strongly than blue light x) blue light is focused more strongly than red light y) the outer light rays are focused more strongly than the central rays, z) the central light rays are focused more strongly than the outer rays.

Description : Refracting telescopes, if uncorrected, suffer from chromatic aberration. Chromatic aberration occurs because: w) red light is focused more strongly than blue light x) blue light is focused more strongly than ... central rays, z) the central light rays are focused more strongly than the outer rays.

Last Answer : ANSWER: X -- BLUE LIGHT IS FOCUSED MORE STRONGLY THAN RED LIGHT 

The term "laminar flow" is most often associated with the description of: w) conduction of sound by waves x) current flow in transistors y) effects of viscosity of liquids z) passage of light rays through a liquid

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Which of the following does NOT travel in a vacuum? w) radio waves x) gamma rays y) magnetic waves z) sound waves

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In radioactive decay, the emission of an electron is characteristic of: w) Alpha decay x) Beta decay y) Gamma decay z) X-rays

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Two light rays will interfere constructively with maximum amplitude if the path difference between them is: w) one wavelength x) one-half wavelength y) one-quarter wavelength z) one-eighth wavelength

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