Which of the following statements is correct in case of Thomson's atomic model?

Options

A. It explains the phenomenon of thermionic emission, photoelectric emission and ionisation.
B. It could not explain emission ofline spectra by elements.
C. It could not explain scattering of a-particles
D. All of the above

Explanation

To determine which statement is correct regarding Thomson's atomic model, we need to analyze the key features and limitations of the model. Here’s a step-by-step solution:

### Step 1: Understand Thomson's Atomic Model
Thomson's atomic model, also known as the "plum pudding model," proposed that atoms are composed of a positively charged "soup" in which negatively charged electrons are embedded like "plums." This model was an early attempt to describe the structure of the atom.

### Step 2: Evaluate the Statements
1. **Thermo-ionic emission, photoelectric emission, and ionization:** Thomson's model does not adequately explain these phenomena. Therefore, this statement is incorrect.

2. **Emission of line spectra by elements:** Thomson's model also fails to explain the discrete line spectra observed in elements. Thus, this statement is also incorrect.

3. **Scattering of alpha particles:** This is a crucial point. Thomson's model could not explain the results of Rutherford's alpha particle scattering experiment, which showed that atoms have a small, dense nucleus. Therefore, this statement is correct.

### Step 3: Conclusion
Based on the evaluation of the statements, the correct statement regarding Thomson's atomic model is that it could not explain the scattering of alpha particles.

### Final Answer
The correct statement in the case of Thomson's atomic model is that it could not explain the scattering of alpha particles.

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