題組內容

For Questions 11.-18. please answer in English. Answers written in Chinese will result in zero scores. 5 points each.

18. A beam of electrons each of de Broglie wavelength m is incident on a thin film of silicon-30. The variation in the electron intensity of the beam with scattering angle is shown below. Use the graph to show that the nuclear radius of silicon-30 is about 4 fm.