Noun
French physicist who discovered that rays emitted by uranium salts affect photographic plates (1852-1908)
Source: WordNetIn the 19th century, experimenters began to detect unexpected forms of radiation: Wilhelm Röntgen caused a sensation with his discovery of X-rays in 1895; in 1896 Henri Becquerel discovered that certain kinds of matter emit radiation on their own accord. Source: Internet
Henri Becquerel himself proved that beta rays are fast electrons, while Rutherford and Thomas Royds proved in 1909 that alpha particles are ionized helium. Source: Internet
In 1896, Henri Becquerel discovered that uranium salts emitted rays that resembled X-rays in their penetrating power. Source: Internet
In 1896, Henri Becquerel found that rays emanating from certain minerals penetrated black paper and caused fogging of an unexposed photographic plate. Source: Internet
Robert Millikan While studying naturally fluorescing minerals in 1896, the French physicist Henri Becquerel discovered that they emitted radiation without any exposure to an external energy source. Source: Internet