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4 cards from this section. Quick, good the night before a test.
Who discovered radioactivity?
Think about the scientist who worked with uranium.
What type of particle is emitted in alpha decay?
This particle is positively charged.
What discovery did Henri Becquerel make?
Think about his work with uranium.
True or False: Alpha particles are negatively charged.
Recall their charge.
Given that alpha particles are stopped by paper, what materials could you use to shield yourself from beta and gamma radiation when working in a lab?
Think about the densities of different materials.
If 50g of a radioactive substance has a half-life of 10 days, how much will remain after 40 days?
Use the formula: remaining amount = original amount / (2^n) where n is the number of half-lives.
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