If the object is falling under the influence of gravity alone, this is called?

gravitational energy

Explanation: If you have a book on a table and it might fall, its using gravitational energy because its depending on gravity to choose rather it will fall or just balance. It also depends on how high the object is off the ground

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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