A radioactive substance emanates `:`

Options

A. Alpha article
B. Beta particle
C. Gamma particle
D. All of these

Answer

To solve the question regarding what a radioactive substance emanates, we need to understand the types of particles emitted during radioactive decay. Here's a step-by-step breakdown:

### Step 1: Identify the Types of Emissions
A radioactive substance can emit three main types of particles:
- **Alpha particles (α)**: Consist of 2 protons and 2 neutrons. They are emitted by heavy nuclei (atomic number greater than 82) to achieve stability.
- **Beta particles (β)**: These can be either electrons or positrons. Beta decay occurs when a neutron is converted into a proton (or vice versa), helping to balance the neutron-to-proton ratio.
- **Gamma rays (γ)**: High-energy electromagnetic radiation emitted from a nucleus transitioning from a high-energy state to a lower energy state. This does not change the number of protons or neutrons but helps the nucleus lose excess energy.

### Step 2: Understand the Purpose of Emission
The primary purpose of these emissions is to convert unstable nuclei into stable ones. Each type of emission serves this purpose in different scenarios:
- **Alpha decay** is common in heavy elements to reduce mass and achieve stability.
- **Beta decay** helps in adjusting the neutron-to-proton ratio, which is crucial for stability.
- **Gamma emission** occurs when the nucleus is in an excited state and needs to release energy without changing its composition.

### Step 3: Conclusion
A radioactive substance can emit:
- Alpha particles
- Beta particles
- Gamma rays

However, it is important to note that a single radioactive substance typically emits one type of particle at a time during its decay process. Therefore, the correct answer to the question "A radioactive substance emanates:" is **all of these** (alpha, beta, and gamma particles).

### Final Answer
**All of these (alpha, beta, and gamma particles)**.

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