Register to reply

Radioactive decay

by ProPatto16
Tags: decay, radioactive
Share this thread:
Sep24-10, 10:23 PM
P: 315
1. The problem statement, all variables and given/known data

Complete the following decay equations by inserting the missing particle or nuclide information. Identify each type of decay.

i) 90?Sr = ?39Y + ? + ?

ii) 22?Na = ??Ne + β+ + ? + energy

iii)24294Pu = ??? + alpha + ?

iv) 235?U = 91?Sr + 141?Xe + ?

v) 0-1e + 0+1e → ?

3. The attempt at a solution

i) 9038Sr = 8939Y + β- + ? this is beta decay.
- note, lost 1 nucleon. is this ? just 1n?

ii) 2211Na = 2010Ne + β+ + ? + energy also beta decay
- note, lost 2 nucleons. is this ? just 21n?

iii) 24294Pu = 23892U + alpha + ? alpha decay

iv) 23592U = 9138Sr + 14154Xe + ? fission?

v) i have no idea.

- Just looking at that, there seems to be an extra ? for each decay equation. in my text throughout theres only the decay pronumeral in the products, not something extra as well. so im not really sure what is meant to go in there?
- Also im not sure about the relevance of the energy is ii) since all of these decays emit energy anyway.
- iv) doesnt look to be any kind of decay, it seems to represent fission. which would make that '?' 31n?
- and v) i have no idea what the result of an electron positron bond is.
Phys.Org News Partner Science news on
'Office life' of bacteria may be their weak spot
Lunar explorers will walk at higher speeds than thought
Philips introduces BlueTouch, PulseRelief control for pain relief
Sep24-10, 11:51 PM
P: 568
v) Matter and antimatter combining to result in something that, according to the superscript and subscript, will have no mass and no charge. That tells us what comes out of it.
Sep24-10, 11:54 PM
P: 315
ohhh... becomes 2 neutrinos where a neutrino is a particle with no charge and mass equal to an electron?... that would conserve mass and charge...

and your not sure about the other '?' either?

Sep25-10, 10:56 PM
P: 315
Radioactive decay

Sep26-10, 09:19 PM
P: 315

just so my thread goes to the top of the list again so more people see it. haha

Register to reply

Related Discussions
Radioactive decay Biology, Chemistry & Other Homework 3
Nuclear Chemistry: Kinetics of Radioactive Decay and Radioactive Dating Biology, Chemistry & Other Homework 1
What is the proper use and meaning of Radioactive decay ? How much decay HAS occured General Physics 2
Radioactive decay equilibrium when decay constants are equal Biology, Chemistry & Other Homework 2
Radioactive Decay Calculus 2