Decay releases a fast moving electron from a neutron in the nucleus.

beta decay releases a fast moving electron from a neutron in the nucleus

In beta decay, a neutron becomes a proton, an electron, and a neutrino (or maybe an anti-neutrino.
Hope this helps. :D

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.