Which of the following is not the property of a cathode rays

Options

A. It produces heating effect
B. It does not deflecte in electric field
C. It casts shadow
D. It produces flurosence

Answer

To solve the question of which of the following is not a property of cathode rays, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Properties of Cathode Rays**:
- Cathode rays are streams of electrons emitted from the cathode in a vacuum tube.
- The known properties of cathode rays include:
- They produce heat when they strike a surface.
- They cause fluorescence in certain materials.
- They cast shadows when they pass through an object.
- They are negatively charged particles and can be deflected by electric and magnetic fields.

2. **List the Given Options**:
- The question likely presents several options, among which we need to identify the one that is not a property of cathode rays.

3. **Evaluate Each Option**:
- **Option 1**: Produces heating effect - This is a property of cathode rays.
- **Option 2**: Produces fluorescence - This is also a property of cathode rays.
- **Option 3**: Casts shadow - This is a property of cathode rays as well.
- **Option 4**: Does not deflect in an electric field - This is NOT a property of cathode rays, as they are indeed deflected by electric fields due to their negative charge.

4. **Conclusion**:
- Based on the evaluation, the statement that cathode rays do not deflect in an electric field is incorrect. Therefore, this is the option that is not a property of cathode rays.

5. **Final Answer**:
- The correct answer is that cathode rays do not reflect in an electric field.