Atoms
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Atoms
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1. The ionization energy of the electron in thehydrogen atom in its ground state is 13.6 eVThe atomsare excited to higher energy levels to emit radiations of6 wavelengthsMaximum wavelength of emittedradiation corresponds to the transition between [2009]
2. The ionisation energy of hydrogen atom is 13.6 eV - the ionisation energy of helium atom would be [1988]
3. When a hydrogen atom is raised from the groundstate to an excited state - [1995]
4. The total energy of electron in the ground state ofhydrogen atom is -“ 13.6 eVThe kinetic energy of anelectron in the first excited state is [2007]
5. In a Rutherford scattering experiment when aprojectile of charge Z 1 and mass M1 approaches a targetnucleus of charge Z 2 and mass M2 - the distance of closestapproach is r0The energy of the projectile is [2009]
6. In Rutherford scattering experiment - what will bethe correct angle for D-scattering for an impactparameter - b =0? [1994]
7. Who indirectly determined the mass of theelectron by measuring the charge of the electron?
8. The half life of radium is about 1600 yearsOf 100g of radium existing now - 25 g will remain unchangedafter [2004]
9. The ratio of longest wavelengths corresponding toLyman and Blamer series in hydrogen spectrum is[2013]
10. The energy of a hydrogen atom in the ground stateis -“ 13.6 eVThe energy of a He+ ion in the first excitedstate will be [2010]
11. The spectrum obtained from a sodium vapourlamp is an example of [1995]
12. When an electron jumps from the fourth orbit tothe second orbit - one gets the [2000]
13. The ground state energy of H-atom 13.6 eV The energy needed to ionize H-atom from its second excitedstate[1991]
14. An alpha nucleus of energy 1/2 mv 2 bombards aheavy nuclear target of charge ZeThen the distance ofclosest approach for the alpha nucleus will beproportional to [2010]
15. In which of the following systems will the radius ofthe first orbit (n = 1) be minimum? [2003]
16. The wavelength of the first line of Lyman series forhydrogen atom is equal to that of the second line ofBalmer series for a hydrogen like ionThe atomicnumber Z of hydrogen like ion is [2011]
17. To explain his theory - Bohr used [1989]
18. Energy E of a hydrogen atom with principalquantum number n is given by E= -“ 13.6/n2 eVTheenergy of photon ejected when the electron jumps fromn = 3 state to n = 2 state of hydrogen is approximately[2004]
19. What is the radius of iodine atom (Atno53 - mass no126) [1988]
20. An electron in the hydrogen atom jumps fromexcited state n to the ground stateThe wavelength soemitted illuminates a photosensitive material havingwork function 2.75 eVIf the stopping potential of thephotoelectron is 10 V - the value of n is [2011]
21. The ground state energy of hydrogen atom is13.6eVWhen its electron is in the first excited state - itsexcitation energy is [2008]
22. The total energy of an electron in the first excitedstate of hydrogen atom is about -“3.4 eVIts kineticenergy in this state is [2005]
23. Which of the following transitions in a hydrogenatom emits the photon of highest frequency? [2000]
24. The radius of hydrogen atom in its ground state is5.3 × 10-“11 mAfter collision with an electron it is foundto have a radius of 21.2 × 10 -“11 mWhat is the principalquantum number n of the final state of the atom [1994]

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