20.1. Radiation http://www.ck12.org
b. This is a fusion reaction.
c. This is not a valid reaction, because the equations don’t balance.- You detect a high number of alpha particles every second when standing a certain distance from a radioactive
material. If you triple your distance from the source, the number of alpha particles you detect will decrease.
By what factor will it decrease?
a.
√
3
b. 3
c. 9
d. 27
e. It will stay the same.- Write the nuclear equationsA→B+Cfor the following reactions.
a. The alpha decay of^219 Ra.
b. The beta decay of^158 Eu.
c. The beta decay of^53 Ti.
d. The alpha decay of^211 Bi. - Radium-226 undergoes alpha decay. What element is produced?
- Write the nuclear reaction for each of the processes described below:
a. Calcium-45 decays to produce Scandium (Sc)
b. undergoes alpha decay
c. helium-3 is produced by beta decay of a certain nuclide
Answers to Selected Problems1..
2..
3. The answers are:
a.^21988 Ra→^21586 Rn+^42 He
b.^15863 Eu→^15864 Gd+^0 − 1 e−
c.^5322 Ti→^5323 Va+^0 − 1 e−
d.^21183 Bi→^20781 Tl+^42 He
4. Radon, Rn-222
5..