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Who is credited with the discovery of Radioactivity?
- Michael Faraday
- Marie Curie
- Henri Becquerel
- Pierre Curie
The phenomenon of radioactivity was first reported in 1896 by Henri Becquerel for a uranium salt. In 1898, Marie Curie and her husband Pierre Curie discovered two other radioactive elements–radium and polonium.
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Which of the following particles is not commonly emitted during radioactive decay?
- Alpha particles
- Beta particles
- Gamma ray
- Protons
During radioactive decay, the radioactive element may emit positively charged alpha particles, negatively charged beta particles, gamma rays or X-rays.
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Which material is commonly used to shield against alpha particles?
- Paper
- Concrete
- Copper
- Mud
Alpha particles are the least penetrating type of radiation. Even the most energetic alpha particles can be stopped by a single sheet of paper.
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