Chapter 37: Answers to Stop to Think Questions and Odd-Numbered Exercises and Problems

Stop to Think Questions

  1. 1. a is emission, b is absorption. All wavelengths in the absorption spectrum are seen in the emission spectrum, but not all wavelengths in the emission spectrum are seen in the absorption spectrum.

  2. 2. b. This observation says that all electrons are the same.

  3. 3. a. The alpha particle speeds up because the positive alpha particle is repelled by the positive nucleus.

  4. 4. Neutral carbon would have six electrons. C++ is missing two.

  5. 5. 6 protons and 8 neutrons. The number of protons is the atomic number, which is 6. That leaves 14−6=8 neutrons.

Exercises and Problems

  1. 1. 410.3 nm, 389.0 nm, 379.9 nm

  2. 3.

    1. m=1, n=3; m=3, n=4

    2. Ultraviolet, infrared

  3. 5.

    1. 9.39×103°C

    2. 694°C

  4. 7. 2.4 μm

  5. 9. 5.0×10−3 T, out of page

  6. 11.

    1. 2.4×10−16 kg

    2. 1.3×10−18 C

    3. Surplus of 8 electrons

  7. 13. 1.33×10−19C

  8. 15.

    1. 1.03×107m/s

    2. 2.6×107m/s

    3. Alpha particle

  9. 17.

    1. 10 keV

    2. 0.14 MeV

    3. 1.2×1019 eV

  10. 19.

    1. 5 electrons, 5 protons, 5 neutrons

    2. 6 electrons, 7 protons, 6 neutrons

    3. 5 electrons, 8 protons, 9 neutrons

  11. 21.

    1. 3H

    2. 18O+

  12. 23.

    1. 82 electrons, 79 protons, 118 neutrons

    2. 2.29×1017 kg/m3

    3. 2.01×1013

  13. 25.

    1. 2.29×1017 kg/m3

    2. 13 km

  14. 27.

    1. 0.999998c

    2. 0.99999997c

  15. 29. 0.9999999896c

  16. 31.

    1. 0.00512 MeV

    2. 9.39 MeV

    3. 37.6 MeV

  17. 33. 8.4°

  18. 35. 9.581×107 C/kg, proton

  19. 37. 0.1040 nm, 1.34×106 m/s

  20. 39. 0.000000000058% contains mass, 99.999999999942% empty space

  21. 41. 5.5 MeV

  22. 43. 1.8×107 V

  23. 45.

    1. 3.43×107 m/s

    2. 6.14×106 V

  24. 47. 2.3×107 m/s, 65.1° below +x-axis

  25. 49.

    1. mg/E0

    2. mg/b

    1. 2.4×10−18 C

    2. 15