The particles emitted by radioactive decay are deflected by magnetic field. The particles will be

Options

A. protons and `alpha`-particles
B. electrons, protons and `alpha` particles
C. electrons, protons and neutrons
D. electrons and `alpha`-particles

Answer

To solve the question regarding which particles emitted by radioactive decay are deflected by a magnetic field, we can follow these steps:

### Step 1: Identify the particles emitted during radioactive decay
Radioactive decay typically emits three types of particles:
- Alpha particles (α)
- Beta particles (β) which are electrons (e⁻)
- Gamma rays (γ), which are electromagnetic radiation and do not have mass or charge.

### Step 2: Determine the charge of each particle
- **Alpha particles (α)**: These are positively charged (2 protons and 2 neutrons).
- **Beta particles (β)**: These are negatively charged electrons.
- **Gamma rays (γ)**: These are neutral and have no charge.

### Step 3: Analyze how each particle behaves in a magnetic field
According to the Lorentz force law, only charged particles are deflected in a magnetic field. The direction of deflection depends on the charge of the particle:
- **Alpha particles** (positive charge) will be deflected in one direction.
- **Beta particles** (negative charge) will be deflected in the opposite direction.
- **Gamma rays** (neutral) will not be deflected at all.

### Step 4: Conclusion
Based on the analysis:
- Alpha particles and beta particles will be deflected by the magnetic field.
- Gamma rays will not be deflected.

Thus, the particles emitted by radioactive decay that are deflected by a magnetic field are **alpha particles and beta particles**.

### Final Answer:
The particles emitted by radioactive decay that are deflected by a magnetic field are **alpha particles and beta particles**.

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