the rate of a nuclear reaction can be changed by??
i know adding a catalyst to a normal reaction can but to a nuclear im not sure.
increasing temp
decreasing pressure
adding a catalyst
none
I suppose it all depends upon how you define a catalyst. Perhaps in a small way increasing T might help but it isn't likely. Decreasing pressure won't have much effect. A catalyst, in the usual sense of a catalyst, won't change it. I think the intent of the problem is to answer none. Adding a neutron or a proton or a helium nucleus to the nucleus of another atom can have a dramatic effect. And I suppose we might even consider a neutron as a catalyst. The definition of a catalyst is something that increases the rate of a reaction without being changed as a final product. In a nuclear reaction, a neutron can be added to another nucleus which will make it unstable and it can split. The original neutron is still a neutron. However, I have never heard of a neutron being used in the sense of being a catalyst for a nuclear reaction.
In nuclear reactions, the rate of the reaction can be changed by adding a neutron or a proton to the nucleus of another atom. This can make the nucleus unstable and cause it to split, resulting in a nuclear reaction. However, this process is not typically referred to as using a catalyst.
Increasing temperature does not significantly affect the rate of a nuclear reaction, and decreasing pressure also has little effect. Adding a catalyst in the usual sense, as it is done in chemical reactions, does not change the rate of a nuclear reaction.
Thus, the correct answer to the question "the rate of a nuclear reaction can be changed by?" is none.