Which nuclear reaction is used to generate electric energy in power plants?
oa. positron emission
ob. gamma decay
oc. nuclear fission
od. nuclear fusion

C. Nuclear fission

Explanation:

Nuclear fission is the reaction in which the nucleus of a heavy atom, when bombarded with neutrons (or when capturing an incident neutron), becomes unstable and divides into two or more nuclei of lighter atoms, giving rise to a situation of greater stability. In this process that takes place in the atomic nucleus, neutrons, gamma rays and large amounts of energy are emitted.  

Then, with this division a great release of energy occurs and the emission of two or three neutrons, other particles and gamma rays.  

This means fission is a process in which energy is released by the separation of the components of the nucleous of the atom.

In other words:

Matter is converted to energy, and in the case of powew plants, in electric energy.

it about 600 mph from what i calculated

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )