This question is misleading to some extent. Nuclear energy is discovered by scientists constantly bombarding atoms with particles combined with Einstein's equation, which is one of the reasons why modern advanced countries like to build particle colliders. Let's look at the discovery process of nuclear fission.

19 19, Rutherford, director of Cavendish Laboratory of Cambridge University in England, bombarded dry nitrogen with alpha particles, hit the nitrogen nucleus, converted nitrogen into oxygen, and released a proton, which proved the existence of protons in the nucleus and speculated the existence of' neutrons'.

1932, chadwick, a student of Rutherford, bombarded beryllium with alpha particles, and then bombarded hydrogen and nitrogen with rays generated by beryllium, producing hydrogen nuclei and nitrogen nuclei, which confirmed the existence of' neutrons'.

After discovering neutrons, scientists began to use neutrons as "shells" to bombard the nuclei of various elements, because neutrons have no charge and are easily absorbed near the nuclei.

1938, Hahn and Strassman conducted the experiment of neutron impact on uranium, and realized neutron-induced uranium fission for the first time.

Mathematically, Methner assumes that the products of uranium fission are produced by uranium nuclear fission. But when she added up the atomic weights of the product elements, she found that it was not equal to the atomic weight of uranium, but less than the atomic weight of uranium.

This shows that there are quality defects in the process of nuclear reaction. According to Methner, this mass defect value is just equivalent to the energy released by the reaction. According to Einstein's mass-energy relationship E = MC 2, she calculated the energy released by each uranium atom during nuclear fission.

Her nephew Fraser designed an experiment to prove the idea. He also bombarded uranium with neutron shells. When the neutron hit the uranium core, he observed that the unusually huge energy almost pushed the pointer of the measuring instrument out of the dial. 1939 In February, Switzerland and Methner published their research results in the journal Nature and discovered the phenomenon of nuclear fission.

Then scientists found that neutron bombardment of uranium not only produces energy, but also produces neutrons, which provides favorable conditions for chain nuclear fission, which is also the basis for making atomic bombs.

As can be seen from the above context, Einstein did not know this phenomenon of nuclear energy at first, but only provided theoretical proof for nuclear fission.