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<p>where in 1892 he was appointed Professor of Applied Physics. In 1894, he became chief engineer in the <a href="page.php?w=Corps_of_Bridges%2C_Waters_and_Forests">Department of Roads and Bridges</a>. He became a professor at École polytechnique in 1895.</p>

<p><big> Discovery of radioactivity </big></p>
<p>Becquerel's discovery of <a href="page.php?w=Radioactive_decay">spontaneous radioactivity</a> is a famous example of <a href="page.php?w=serendipity">serendipity</a>. Becquerel had long been interested in <a href="page.php?w=phosphorescence">phosphorescence</a>,</p><p>
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