In an experiment to determine the speed of sound, a gun fired and an observer at a distance away measured the time interval between seeing the flash of the gun and hearing the shot. Which of the following will not affact affect the result?
(1) The frequency of the gunshot.
(2) The temperature of the environoment.
(3) The loudness of the gunshot.

Options

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

Answer

To determine which factors will not affect the speed of sound in the given experiment, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Experiment**:
- In the experiment, a gun is fired, and an observer measures the time interval between seeing the flash of the gun and hearing the shot.
- The speed of sound is calculated using the formula:
\[ \text{Speed of Sound} = \frac{\text{Distance}}{\text{Time}} \]

2. **Analyzing the Factors**:
- **(1) The frequency of the gunshot**:
- The frequency of the sound produced by the gunshot is related to the pitch of the sound, but it does not affect the speed of sound in a medium. The speed of sound is determined by the properties of the medium (like temperature) rather than the frequency of the sound itself.
- **Conclusion**: The frequency of the gunshot does not affect the speed of sound.

- **(2) The temperature of the environment**:
- The speed of sound is directly proportional to the square root of the temperature of the medium through which it travels. As the temperature increases, the speed of sound also increases.
- **Conclusion**: The temperature of the environment does affect the speed of sound.

- **(3) The loudness of the gunshot**:
- Loudness is related to the amplitude of the sound wave and does not influence the speed of sound. The speed of sound remains constant regardless of how loud the sound is.
- **Conclusion**: The loudness of the gunshot does not affect the speed of sound.

3. **Final Answer**:
- The factors that will not affect the result (the speed of sound) are:
- (1) The frequency of the gunshot.
- (3) The loudness of the gunshot.

### Summary:
The correct answer is that the frequency of the gunshot and the loudness of the gunshot will not affect the speed of sound. The only factor that will affect it is the temperature of the environment.