Inquiry into the disintegrative processes within atoms became a central theme in the new physics in part due to whose experimental work?

Question

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Marie and Pierre Curie's experimental work on radium and radiation played a key role in the development of the new physics and the study of disintegrative processes within atoms. Their discovery of radioactivity and the decay of unstable atoms led to further research in this area. Planck's work on quanta and Einstein's work on cosmic rays and gravity were also important contributions to the new physics, but they were not specifically focused on disintegrative processes within atoms.

Inquiry into the Disintegrative Processes Within Atoms Became a Central