1.Which type of radioactive emission is analogous to an electronbeing emitted?
positron, neutrons, alpha particle, gamma rays, betaparticle
2. Which isotope is naturally radioactive?
42H, 21H,168O, 23488Ra
3. the half life of protactinium-231 is 3.5x104years. How long will it take for 10.4 grams of Pa-231 to decay to2.6 grams?
4. the half life of phorphorous-33 is 25.3 days. How long willit take for 64 grams of p-33 to decay to 1.0 grams?
5. the half life of sr-83 is 32.4 hours. how many emissions areproduced when 20 g of strontium-83 decas to 4.0 grams?
