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SSC Stenographer 2022 PYQ — Question 101

SSC Stenographer - 17 Nov 2022 - Shift 3 • General Awareness • Q101

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In which year did Henri Becquerel discover that uranium salts emit a penetrating radiation that can be registered on a photographic plate?
 

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Correct answer: C

Explanation

The corret answer is option 3 i.e. 1896

  • Henri Becquerel discovered in 1896 that uranium salts emitted penetrating radiation that could be transmitted onto a photographic plate.
  • Henri Becquerel was a physicist, a Nobel laureate, and the first person to discover evidence of radioactivity.
  • Together with Marie Curie and Pierre Curie, she was awarded the 1903 Nobel Prize in Physics for her work in this area.
  • In 1900, Becquerel calculated the properties of beta particles and found that they had the same measurements as high-speed electrons leaving the nucleus.
  • In 1901, Becquerel discovered that radioactivity could be used for medical purposes. This breakthrough contributed to the invention of radiotherapy which is still used to treat cancer.