During the Middle Ages.
Henri Becquerel discovered that Uranium is a radioactive element. He did experiments and investigation of Uranium and other substances. He also studied a type of photoluminescence that is related to fluorescence.
Henri Becquerel accidently discovered radioactivity while conducting experiments on phosphorescence. He saw that photographic plates that were still wrapped in their black paper packaging was exposed when placed near uranium salts. Therefore, this suggested a type of radiation that can pass through solid matter. He went on the share a Nobel prize with the Curies.
not to sure about matter but ill give it a try
Screening
why do scientist perform experiments?
Chemists perform experiments to find out different kinds of matter can change.
Scientists perform experiments to collect data.
Henri Becquerel shared a Nobel award in 1903 with Marie and Pierre Curie for the discovery of spontaneous nuclear radiation through experiments in 1896 involving the phosphorescence of Uranium Salts; specifically, potassium uranyl sulfate.
Yes Dr. Christiaan Barnard did perform his first experiments on 50 dogs 35 cats and some rats.
Experiments.
things
During the Middle Ages.
To answer specific questions
To prove or disprove a theory. If you didn't perform experiments you wouldn't have the evidence to move forward in your scientific knowledge. Try an experiment 4 times to get a reliable average result.
Depends on what they're researching, but often in a laboratory.
controlled experiments