Imagine a cannon being fired on the surface of the moon. Then

Options

A. the sound will be heard at the surface of the earth during all seasons
B. the sound will not be heard at the surface of the earth but will be heard on the moon.
C. the sound will be heard at the surface of the earth during the rainy season
D. no sound will be heard on the earth or on the moon

Answer

To solve the question regarding the firing of a cannon on the surface of the moon and the propagation of sound, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sound Propagation**:
- Sound is a mechanical wave that requires a medium (like air, water, or solid materials) to travel. Without a medium, sound cannot propagate.

2. **Analyzing the Moon's Atmosphere**:
- The moon has a very thin atmosphere, which is not sufficient to support sound propagation. In fact, it is almost a vacuum. Therefore, there is no medium on the moon's surface for sound waves to travel through.

3. **Evaluating the Options**:
- **Option 1**: "The sound will be heard at the surface of the earth during all seasons."
- This option is incorrect because sound waves cannot travel through the vacuum of space from the moon to the Earth.

- **Option 2**: "The sound will be heard on the moon."
- This option is also incorrect because, although the cannon is fired on the moon, there is no medium for the sound to travel through on the moon itself.

- **Option 3**: "The sound will be heard at the surface of the earth during rainy season."
- This option is incorrect for the same reason as option 1; sound cannot travel through the vacuum of space.

- **Option 4**: "No sound will be heard on the earth or on the moon."
- This option is correct because there is no medium on the moon for sound to propagate, and thus no sound will be heard either on the moon or on Earth.

4. **Conclusion**:
- The correct answer is that no sound will be heard on the Earth or on the moon due to the absence of a medium for sound propagation.

### Final Answer:
**No sound will be heard on the Earth or on the moon.**

---