What did Ernest Rutherford discover about alpha radiation?
It's made of protons
It's made of neutrons
It's made of helium nuclei
It's made of electrons
Answer
Ernest Rutherford, along with Thomas Royds, discovered that alpha radiation is made up of helium nuclei. This was a significant breakthrough in understanding the nature of radiation.
Discovering the Atomic Frontier: The Remarkable Life of Ernest Rutherford