Two pieces of iron with the different masses - 500 g and 1000 g - both have 4.5 kJ of energy added to them.
Which would be warmer and why?

1000g

Explanation:because the higher mass takes up heat.

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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where's the diagram?