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39-CHEM-2-Atomic Structure Topic1 Preliminary Developments and Bohr’s Model Objective Questions I (Only one correct option) 4. A stream of electrons from a heated filament was passed between two charyed plates kept at a potential difference V esu, If ¢ and m are charge and mass of an electron. respectively, then the value of A/A (where, A is wavelength associated with electron wave) is given by (2016 Main) (a) 2 meF (b) VmeV (c) {2meF (d) meV 1. Plan As youcan seein options, energy term is mentioned hence, we have to find out relation betweenh / ) and energy. For this, we shall use de-Broglie wavelength and kinetic energy term in eV. de-Broglie wavelength for an electron (A )= A P A - => y= + (i) POE Kinetic energy of an electron = eV 2 As we know that. KE = 2 2m 2 a“ eV= - or p=v2meY we(ii) mn =V2meV | > From equations (i) and (ii), we get 2. Rutherford's experiment. which established the nuclear model of the atom, used a beam of (2002, 3M) (a) B-particles. which impinged on a metal foil and got absorbed (b) y-rays, which impinged on a metal foil and got scattered (c) helium atoms, which impinged on a metal foil and got scattered a (d) helium nuclei, which impinged on a metal foil and got scattered 2. Rutherford used «particle (He** nuclei) in his experiment. 3. Rutherford's alpha particle scattering experiment eventually led to the conclusion that (1986, 1M) (a) mass and energy are related (b) electrons occupy space around the nucleus (c) neutrons are burried deep in the nucleus (d) the point of umpact with matter can be precisely determined 
