Radium- $221$ Has a Half-Life Of $30 \mathrm {~s}$ Suppose We Have A Of 30

question 78

Essay

Radium- $221$ has a half-life of $30 \mathrm {~s}$ . Suppose we have a $300 \mathrm {~g}$ sample.
(a) Find a formula for the mass remaining after $t$ seconds.
(b) How much of the sample remains after $200$ seconds?
(c) After how long will only $20 \mathrm {~g}$ remain?

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Definitions:

More Resources

Refers to increasing or expanding the availability of materials, tools, finances, or personnel required for a task or organization.

Replacing

The action of taking something out and putting another thing in its place.

Transferring

The process of moving or assigning an employee, resources, or responsibilities from one position, location, or task to another within an organization.

Collaboration

A conflict management style in which the person works through conflict differences and solves problems so everyone wins.