Radioactive Radium ${ } ^ { 226 } \mathrm { R }$

question 123

Multiple Choice

Radioactive radium, ${ } ^ { 226 } \mathrm { R }$ , has a half-life of 1620 years. If you start with 5.00 grams of the isotope, how much will remain after 1000 years? Round your answer to two decimal places.

• A)1.91 grams
• B)4.74 grams
• C)5.00 grams
• D)2.70 grams
• E)6.00 grams

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Definitions:

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A psychological study conducted by Philip Zimbardo in 1971 at Stanford University, where students were assigned roles of prisoners and guards to explore the effects of perceived power.

Generalization

Drawing a conclusion about a certain characteristic of a population based on a sample from it.

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The provision of reasons or evidence to justify a claim or argument.

Opinion Reasonable

A viewpoint that is supported by logic and evidence, making it sound and acceptable.