Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (*He) from gold-197 nuclei (197Au). The energy of the incoming helium nucleus was 7.25 × 10-13 J, and the masses of the helium and gold nuclei were 6.68 x 10-27 kg and 3.29 x 10-25 kg, respectively (note that their mass ratio is 4 to 197. Assume that the helium nucleus travels in the +x-direction before the collision.) (a) If a helium nucleus scatters to an angle of 132° during an elastic collision with a gold nucleus, calculate the helium nucleus' final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the +x-axis) of the gold nucleus. 120° He nucleus ý. Gold nucleus 4Нe speed m/s 197 Au velocity m/s 197 Au direction ° counterclockwise from the +x-axis (b) What is the final kinetic energy (in J) of the helium nucleus?

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**Title: Understanding Rutherford Scattering**

**Content:**

Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei \((^4\text{He})\) from gold-197 nuclei \((^{197}\text{Au})\).

The energy of the incoming helium nucleus was \(7.25 \times 10^{-13} \, \text{J}\), and the masses of the helium and gold nuclei were \(6.68 \times 10^{-27} \, \text{kg}\) and \(3.29 \times 10^{-25} \, \text{kg}\), respectively (note that their mass ratio is 4 to 197). Assume that the helium nucleus travels in the \(+\text{x-direction}\) before the collision.

**Problem Statement:**

(a) If a helium nucleus scatters to an angle of 132° during an elastic collision with a gold nucleus, calculate the helium nucleus' final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the \(+\text{x-axis}\)) of the gold nucleus.

- **Diagram Explanation:**
  - The diagram shows an incoming helium nucleus moving towards a gold nucleus along a straight path.
  - The helium nucleus is depicted with a green arrow labeled \(\vec{v_i}\), indicating its initial velocity.
  - Upon collision, the helium nucleus scatters at an angle of 132° relative to its initial path.
  - The gold nucleus deflects at an angle of 120° from its initial position.

- **Inputs Required:**
  - \( ^4\text{He } \text{speed:} \ \_\_\ \text{m/s} \)
  - \( ^{197}\text{Au } \text{velocity:} \ \_\_\ \text{m/s} \)
  - \( ^{197}\text{Au } \text{direction:} \ \_\_\ ^\circ \text{ counterclockwise from the } +\text{x-axis} \)

(b) What is the final kinetic energy (in J) of the helium nucleus?

- **Input Required:**
  - \_\_\ J

**Note:** This analysis helps illustrate the principles of nuclear structure and the behavior of subatomic particles during elastic collisions
Transcribed Image Text:**Title: Understanding Rutherford Scattering** **Content:** Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei \((^4\text{He})\) from gold-197 nuclei \((^{197}\text{Au})\). The energy of the incoming helium nucleus was \(7.25 \times 10^{-13} \, \text{J}\), and the masses of the helium and gold nuclei were \(6.68 \times 10^{-27} \, \text{kg}\) and \(3.29 \times 10^{-25} \, \text{kg}\), respectively (note that their mass ratio is 4 to 197). Assume that the helium nucleus travels in the \(+\text{x-direction}\) before the collision. **Problem Statement:** (a) If a helium nucleus scatters to an angle of 132° during an elastic collision with a gold nucleus, calculate the helium nucleus' final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the \(+\text{x-axis}\)) of the gold nucleus. - **Diagram Explanation:** - The diagram shows an incoming helium nucleus moving towards a gold nucleus along a straight path. - The helium nucleus is depicted with a green arrow labeled \(\vec{v_i}\), indicating its initial velocity. - Upon collision, the helium nucleus scatters at an angle of 132° relative to its initial path. - The gold nucleus deflects at an angle of 120° from its initial position. - **Inputs Required:** - \( ^4\text{He } \text{speed:} \ \_\_\ \text{m/s} \) - \( ^{197}\text{Au } \text{velocity:} \ \_\_\ \text{m/s} \) - \( ^{197}\text{Au } \text{direction:} \ \_\_\ ^\circ \text{ counterclockwise from the } +\text{x-axis} \) (b) What is the final kinetic energy (in J) of the helium nucleus? - **Input Required:** - \_\_\ J **Note:** This analysis helps illustrate the principles of nuclear structure and the behavior of subatomic particles during elastic collisions
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