How Long Will It Take a Sample of Radioactive Substance $\mathrm { A } ( \mathrm { t } ) = 650 \mathrm { e } ^ { - 0.189 t }$

question 180

Multiple Choice

How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the functi $\mathrm { A } ( \mathrm { t } ) = 650 \mathrm { e } ^ { - 0.189 t }$ , where t is the time in years? Round your answer to the nearest
Hundredth year.

• A) 3.67 years
• B) 34.27 years
• C) 122.85 years
• D) 37.94 years

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Definitions:

Land Held

Land held pertains to property owned by an entity as an investment or for future use, not immediately purposed for business operations.

Accumulated Depreciation

The total amount of depreciation expense that has been recorded against an asset over its useful life, reducing its book value.

Original Cost

Original Cost refers to the initial monetary value of an asset or investment at the time of purchase, before any depreciation, amortization, or impairment charges are applied.

Accumulated Depreciation

The cumulative depreciation expense registered for an asset from the time it was initially utilized.