Multiple choice

After how many alpha & beta decays Th-234 will produce Ra-220?

  1. 2 alpha + 3 beta

  2. 7 alpha + 4 beta

  3. 5 alpha + 4 beta

  4. 4 alpha + 3 beta

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The uranium decay-series contains several radioactive isotopes.U-238 decays by alpha emission into thorium Th-234. Th-234 decays by 2 alpha & 3 beta emission changes into Ra-220.