The uncertainty principle and the concept of wave nature of matter were proposed by ...............and ...............respectively.

Answer

To solve the question, we need to identify the scientists associated with the uncertainty principle and the wave nature of matter.

### Step-by-Step Solution:

1. **Identify the Uncertainty Principle**: The uncertainty principle is a fundamental concept in quantum mechanics that states it is impossible to simultaneously know the exact position and exact momentum of a particle. This principle is crucial in understanding the behavior of very small particles, such as electrons.

2. **Determine the Scientist for the Uncertainty Principle**: The uncertainty principle was proposed by **Werner Heisenberg**. He introduced this concept in 1927, emphasizing the limitations of measuring both position and momentum at the same time.

3. **Identify the Concept of Wave Nature of Matter**: The wave nature of matter refers to the idea that particles, such as electrons, exhibit both wave-like and particle-like properties. This duality is essential in quantum mechanics.

4. **Determine the Scientist for the Wave Nature of Matter**: The concept of wave nature of matter was proposed by **Louis de Broglie** in 1924. He suggested that if light can behave as both a particle and a wave, then matter should exhibit similar dual characteristics.

### Final Answer:
The uncertainty principle was proposed by **Heisenberg**, and the concept of wave nature of matter was proposed by **de Broglie**.

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