Practice_Test_5_with_Solutions

Practice_Test_5_with_Solutions - SolutionstoPracticeTest5 1.

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Solutions to Practice Test 5 1. Choose the statement(s) that is/are true about Rutherford’s alpha scattering experiment. (i) Most of the alpha particles suffered very little deviation while passing through the gold foil. (ii) Most of the alpha particles suffered significant deviation while passing through the gold foil. (iii) A few particles were deflected through large angles. (iv) Only a few particles passed through the gold foil. Answer: b 2. Choose the statement(s) that is/are true about the nuclear force. nuclear forces are responsible for holding the nuclear particles together. nuclear force is short ranged. nuclear force is weaker than electric force. (iv) nuclear force act through long distance. d 3. Choose the correct representation(s) that is/are used for carbon 12 atom. 12 6 C 12 C C 6 (iv) C 6 a 4. Choose the statement(s) that is/are true about the isotopes of an element isotopes have same atomic number but different mass number. isotopes have same mass number but different atomic number. all isotopes of an element have the same mass number (iv) all isotopes of an element have the same number of protons in the nucleus. c 5. How many neutrons are there in the nucleus of 238 92 ? U The number of neutrons = A – Z = 238 – 92 = 146 b 6. How many protons are there in the nucleus of 238 92 ? U The number of protons = Z = 92
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Answer: d 7. How many nucleons are there in the nucleus of 238 92 ? U The number of nucleons = A = 238 a 8. Choose the statement(s) that is/are true about Bohr model of the atom. (i) electrons orbit the nucleus in fixed energy levels where they will not radiate energy. (ii) The energy of an electron in an orbit depends on the radius of the orbit. (iii) An atom is stable when its electrons occupy orbits of the lowest possible energy. (iv) An electron in an outer orbit has greater energy than an electron in an inner orbit. All these statements are true of Bohr’s model of the atom c 9. Choose the statement(s) that is/are true about the isotopes of an element isotopes have same atomic number but different mass number. isotopes have same mass number but different atomic number. all isotopes of an element have the same mass number (iv) all isotopes of an element have the same number of protons in the nucleus. 10. According to the Bohr model of the atom, what is the radius of the orbit of the ground state electron in a hydrogen atom? 2 22 0.0529(1) = 0.0529 nm 4 n h rn ke m π == 11. electron in an orbit corresponding to the principal quantum number n = 3? 2 0.0529(3) = 0.4761 nm 4 n h ke m b 12. According to the Bohr model of the atom, what is the speed of the ground state electron in a hydrogen atom? For the ground state, n = 1 and r = 0.0529 nm
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34 61 31 9 16 . 6 31 0 = 2.19 10 m.s 2 2 9.11 10 0.0529 10 nh v mr ππ −− ×× == × × × Answer: c 13. According to the Bohr model of the atom, what is the energy of the ground state electron in a hydrogen atom? 22 2 2 224 2 4 21 1 13.62 13.62 eV 1 n n n ke ke ke m E rh
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This note was uploaded on 05/01/2011 for the course PHY 2049 taught by Professor George during the Spring '11 term at Edison State College.

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Practice_Test_5_with_Solutions - SolutionstoPracticeTest5 1.

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