Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k=1.6 x 10-3 yr-¹. By contrast, phophorus-32, which is used for the analysis of metabolic pathways, has a rate constant for radioactive decay of k = 0.050 day-1 ▼ ▼ Part D How much of a 1.04 mg sample of americium remains after 3 half-lives? Express your answer in milligrams to two significant figures. 15. ΑΣΦ m= Submit Part E m = Submit Request Answer How much of a 2.83 mg sample of phophorus remains after 3 half-lives? Express your answer in milligrams to two significant figures. ΨΕΙ ΑΣΦ Part F Request Answer ? D Π| ΑΣΦ mg How much of a 1.00 mg sample of americium remains after 4 days? Express your answer in milligrams to two significant figures. 11 ? mg

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**Radioactive Decay in Common Elements**

Americium-241 and phosphorus-32 are two elements used in practical applications due to their radioactive properties. Here's a brief overview of each element and relevant calculations related to their decay.

---

### Americium-241

**Usage**: Americium-241 is widely used in smoke detectors. 

**Decay Properties**: 
- It has a first-order rate constant for radioactive decay given by \( k = 1.6 \times 10^{-3} \, \text{yr}^{-1} \).

### Phosphorus-32

**Usage**: Phosphorus-32 is utilized for the analysis of metabolic pathways.

**Decay Properties**:
- It has a rate constant for radioactive decay of \( k = 0.050 \, \text{day}^{-1} \).

---

### Problem Statements and Calculations

#### Part D

**Problem**: How much of a 1.04 mg sample of americium remains after 3 half-lives? 

**Requirement**: Express your answer in milligrams to two significant figures.

**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.

#### Part E

**Problem**: How much of a 2.83 mg sample of phosphorus remains after 3 half-lives? 

**Requirement**: Express your answer in milligrams to two significant figures.

**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.

#### Part F

**Problem**: How much of a 1.00 mg sample of americium remains after 4 days? 

**Requirement**: Express your answer in milligrams to two significant figures.

**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.

---

Each section provides space for students to calculate the remaining amount of a radioactive sample based on its decay properties, stressing the importance of understanding first-order decay kinetics.
Transcribed Image Text:**Radioactive Decay in Common Elements** Americium-241 and phosphorus-32 are two elements used in practical applications due to their radioactive properties. Here's a brief overview of each element and relevant calculations related to their decay. --- ### Americium-241 **Usage**: Americium-241 is widely used in smoke detectors. **Decay Properties**: - It has a first-order rate constant for radioactive decay given by \( k = 1.6 \times 10^{-3} \, \text{yr}^{-1} \). ### Phosphorus-32 **Usage**: Phosphorus-32 is utilized for the analysis of metabolic pathways. **Decay Properties**: - It has a rate constant for radioactive decay of \( k = 0.050 \, \text{day}^{-1} \). --- ### Problem Statements and Calculations #### Part D **Problem**: How much of a 1.04 mg sample of americium remains after 3 half-lives? **Requirement**: Express your answer in milligrams to two significant figures. **Solution Area**: - Input box for the answer in milligrams. - Submit button for answer evaluation. #### Part E **Problem**: How much of a 2.83 mg sample of phosphorus remains after 3 half-lives? **Requirement**: Express your answer in milligrams to two significant figures. **Solution Area**: - Input box for the answer in milligrams. - Submit button for answer evaluation. #### Part F **Problem**: How much of a 1.00 mg sample of americium remains after 4 days? **Requirement**: Express your answer in milligrams to two significant figures. **Solution Area**: - Input box for the answer in milligrams. - Submit button for answer evaluation. --- Each section provides space for students to calculate the remaining amount of a radioactive sample based on its decay properties, stressing the importance of understanding first-order decay kinetics.
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