Which of the following statements are true? The speed of light is the same in al

Question

Which of the following statements are true?

The speed of light is the same in all reference frames.

The light-year is a unit of distance.

Proper time is the longest time interval between two events.

If two particles are tightly bound together by strong attractive forces, the rest mass of the system is less than the sum of the masses of the individual particles when separated.

Absolute motion cannot be determined by means of length contraction.

Simultaneous events must occur at the same place.

If two events are not simultaneous in one frame, they cannot be simultaneous in any other frame.

Explanation / Answer

1. The speed of light is the same in all reference frames. (True)

2. The light-year is a unit of distance. (True)

3. Proper time is the longest time interval between two events.(False) (Due to effect of time dilation)

4. If two particles are tightly bound together by strong attractive forces, the rest mass of the system is less than the sum of the masses of the individual particles when separated. (True) (mass defects is equal to binding energy)

5. Absolute motion cannot be determined by means of length contraction. (True)

6. Simultaneous events must occur at the same place. (False) (same time)

7. If two events are not simultaneous in one frame, they cannot be simultaneous in any other frame.(False)

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