Exposure of a photographic plate was the event that best helped Becquerel to determine uranium radiates rays. The correct option in regards to the given question is option "D". Henri Becquerel was a French physicist and he was born on 15th December 1852 and died on 25th August 1908. He was the scientist that discovered radioactivity. In the year 1903, he was awarded with the Nobel Prize for physics for the ground breaking work he did. In the year 1896, Becquerel published seven important papers on his work on radioactivity. This was the work that made him famous around the globe.
