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EM-WAVES-DUAL-NATURE-ATOMS-AND-NUCLEI

EM-WAVES-DUAL-NATURE-ATOMS-AND-NUCLEI - ATOMSANDNUCLEI...

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ATOMS AND NUCLEI Question bank (Schr ö dinger Group) ONE MARK QUESTIONS 1. What will be the ratio of radii of two nuclei of mass numbers A1 and A2? 2. What is Bohr quantization condition for the angular momentum of electron in the second orbit? 3. The sequence is represented as   if the mass numbers and atomic numbers of D 2  are 176  and 71 respectively, what is the mass number and atomic number of D. 4. The wavelength of some of the spectral lines obtained in hydrogen spectrum are 9546 A, 6463 A, 1216  A. which one of these wavelengths belongs to Lymann series. 5. Why do   particles have high ionizing power? α 6. What happens to the neutron to protn ratio after the emission of alpha particles? 7. Define impact parameter. 8. What is the ratio of nuclear densities of two nuclei having mass number 1:4? TWO MARKS QUESTIONS 9. Assuming the nuclei to be spherical in shape how does the surface area of nucleus of mass number A vary with that of nucleus of mass number A 2 ? 10. Radioactive isotope of silver has half-life of 20 minutes. What fraction of the original mass would remain  after one hour? 11. Group the following four nuclides into two pairs of isotones and isobars.  12. Draw a graph showing the variation of potential energy between the pair of nucleons as the function of  their separation. Indicate the regions in which the nuclear force is attractive and repulsive. 13. Calculate the radius of the smallest orbit of hydrogen atom. 14. Calculate the frequency of the photon which can excite an electron to -3.4 eV from -13.6 eV. 15. You are given two nuclei  explain giving reasons as to which one of the nuclei is likely to be  more stable. 16. Show that the speed of the electron in the second orbit of hydrogen like atom He +  is equal to speed of  an electron in the hydrogen atom. 17. What are the limitations of Bohr atomic model? 18. The energy levels of an element X are shown in the figure. A hoton of wavelength 620 nm is emitted  and this corresponds to which of the transition A, B, C, D or E?
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3 MARKS QUESTIONS 19. Calculate the speed of electron revolving around the nucleus of a hydrogen atom in order that it may  not be pulled into the nucleus by electrostatic attraction. 20. What is the distance of closest approach and derive an expression for the same? 21. Draw a labeled diagram of Geiger – Marsden experiment on th scattering of   particles. How is the size α   of the nucleus estimated based on the experiment?
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