MCAT Physics Question 129: Answer and Explanation
Home > MCAT Test > MCAT physics practice tests
Test Information
- Use your browser's back button to return to your test results.
- Do more MCAT physics practice tests.
Question: 129
9. Which of the following correctly identifies the following process?
- A. β- decay
- B. β+ decay
- C. e- capture
- D. γ decay
Correct Answer: C
Explanation:
This process can be described as electron capture. Certain unstable radionuclides are capable of capturing an inner electron that combines with a proton to form a neutron. The atomic number becomes one less than the original, but the mass number remains the same. Electron capture is a relatively rare process and can be thought of as the reverse of β? decay. Notice that the equation is similar to that of β+ decay but not identical because a particle is absorbed, not emitted.