Find out the incorrect match .

Options

A. `electron - dual nature
B. Rainbow- Discontinuous spectra
C. Atom - Line spectra
D. Particle nature - photoelectric effect

Answer

To solve the question "Find out the incorrect match," we will analyze each statement provided in the question and determine which one is incorrect.

### Step-by-Step Solution:

1. **Analyze the first statement: "Electron has dual nature."**
- This statement refers to the concept introduced by Louis de Broglie, which states that electrons exhibit both wave-like and particle-like properties.
- **Conclusion:** This statement is correct.

2. **Analyze the second statement: "Rainbow is a discontinuous spectra."**
- A rainbow is formed when light is refracted and dispersed through water droplets, resulting in a spectrum of colors (red, orange, yellow, green, blue, indigo, violet).
- This spectrum is continuous because there are no gaps between the colors; they blend into one another.
- **Conclusion:** This statement is incorrect.

3. **Analyze the third statement: "Atom shows line spectra."**
- When electrons in an atom absorb energy, they can jump to higher energy levels. When they return to lower energy levels, they emit light at specific wavelengths, resulting in a line spectrum.
- **Conclusion:** This statement is correct.

4. **Analyze the fourth statement: "Photoelectric effect proves particle nature of light."**
- The photoelectric effect demonstrates that light can be thought of as consisting of particles (photons) that can eject electrons from a material when the light shines on it.
- **Conclusion:** This statement is correct.

### Final Conclusion:
The only incorrect match among the statements is the second one: "Rainbow is a discontinuous spectra."