In which situation is mechanical energy converted to electrical energy?

The correct answer is option D.using a generator

Explanation:

An electric generator is a rotary machine capable of producing electrical energy by transforming mechanical energy. In other words, a generator is an electric machine that transforms mechanical energy into electrical energy, thanks to the interaction of its main components: the rotor (moving part) and the stator (static part). When an electric generator is in operation, one of the two parts generates a magnetic flux (acts as an inductor) so that the other transforms it into electricity (acts as induced).

That is, the mobile rotor or inductor generates the magnetic field on which the operation of the generator is based, while the stator or fixed armature generates the electrical energy.

So, the correct answer is option D.using a generator

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.