A Sample of 400 Grams of Radioactive Substance Decays According $\mathrm { A } ( \mathrm { t } ) = 400 \mathrm { e } ^ { - .035 \mathrm { t } }$

question 388

Multiple Choice

A sample of 400 grams of radioactive substance decays according to the function $\mathrm { A } ( \mathrm { t } ) = 400 \mathrm { e } ^ { - .035 \mathrm { t } }$ , where t is the time in years. How much of the substance will be left in the sample after 10 years? Round your answer to the
Nearest whole gram.

• A) 0 g
• B) 12 g
• C) 1 g
• D) 282 g

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Definitions:

Preoperational

A stage in Jean Piaget's theory of cognitive development, typically from ages 2 to 7, where children start to use language and symbols but do not yet understand concrete logic or the principle of conservation.

Piaget

Refers to Jean Piaget, a Swiss psychologist known for his pioneering work in child development and cognitive theory.

Egocentrism

The inability to differentiate between self and others, often leading to a perspective that is overly centered on one's own views and experiences, without adequately considering those of others.

Preoperational

A stage in Piaget's theory of cognitive development where children from about 2 to 7 years old are able to engage in symbolic play but not yet capable of logical thought.