The repetition of sound heard in a cave or empty room is a case of ...........

Options

A. echo
B. superposition
C. interpolation
D. reverberation

Explanation

To solve the question regarding the repetition of sound heard in a cave or empty room, we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Question
The question asks about the phenomenon that describes the repetition of sound in a cave or empty room.

### Step 2: Analyze the Options
The options given are:
1. Echo
2. Superposition
3. Interpolation
4. Reverberation

### Step 3: Define Each Option
- **Echo**: This is the reflection of sound that is heard after a delay, typically when sound bounces off a surface and returns to the listener.
- **Superposition**: This refers to the principle where two or more waves overlap and combine to form a new wave.
- **Interpolation**: This is a mathematical method used to estimate values between two known values, not related to sound.
- **Reverberation**: This is the persistence of sound in a particular space due to multiple reflections of sound waves off surfaces.

### Step 4: Relate the Options to the Scenario
In a cave or empty room, sound waves can reflect off the walls, creating a prolonged sound effect. This is due to the lack of materials that absorb sound, allowing it to bounce around multiple times.

### Step 5: Identify the Correct Answer
Given the definitions and the scenario described, the correct answer is **Reverberation**. This is because the sound is reflected multiple times in the cave or empty room, leading to a prolonged sound effect.

### Final Answer
The repetition of sound heard in a cave or empty room is a case of **Reverberation**.

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