If your were in a spaceship traveling at a speed close to the speed of light (with respect to Earth) you would notice that

Options

A. Your pulse rate is different than normal
B. Some of your physical dimensions where smaller than normal
C. Your mass is different than normal
D. None of these effects occur

Answer

To solve the question regarding the effects experienced in a spaceship traveling at a speed close to the speed of light, we can analyze the options provided and apply our understanding of the theory of relativity.

### Step-by-Step Solution:

1. **Understanding the Context**:
- When traveling at speeds close to the speed of light (denoted as \( c \)), several relativistic effects come into play, as described by Einstein's theory of relativity.

2. **Analyzing the Options**:
- **Option 1**: "Your pulse rate is different than normal."
- This statement suggests that the physiological effects of traveling at such high speeds would alter your pulse rate. However, while time dilation occurs, it does not directly affect your biological functions in a way that would change your pulse rate as perceived by you. Thus, this option is **false**.

- **Option 2**: "Some of your physical dimensions were smaller than the normal."
- This option refers to the phenomenon of length contraction, which states that objects moving at relativistic speeds will appear shorter in the direction of motion to an outside observer. However, from your own perspective inside the spaceship, your physical dimensions would not appear smaller to you. Therefore, this option is also **false**.

- **Option 3**: "None of these effects occur."
- This option suggests that none of the previously mentioned effects occur. However, while you may not notice changes in your pulse rate or physical dimensions, relativistic effects such as time dilation and length contraction do occur, but they are not perceived in the same way by the traveler. Thus, this option is misleading.

- **Option 4**: "All of the above statements are incorrect."
- Since both options 1 and 2 are indeed incorrect, this option is **correct**.

3. **Conclusion**:
- The correct answer is **Option 4**: "All of the above statements are incorrect."