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(a) Alpha radiation

(b) Beta radiation

(c) Positron emission

(d) Fission

Answer (a) Alpha radiation

Explanation:

2. The uranium-235 radioactive decay series ends with the formation of207Pb. How many alpha (α) and beta (β) particles are emitted in this series?

(a) 8 α and 4 β

(b) 7 α and 4 β

(c) 7 α and 6 β

(d) 6 α and 4 β

Answer (b) 7 α and 4 β

Explanation:

3. Which of the following reactions involves emission of a beta particle?

(a) 137N-136C+?

(b) 4120Ca + 0-1e?

(c) 9038Sr 9039Y +?

(d) 23290Th22888Ra+?

Answer (c) 9038Sr 9039Y +β

Explanation: