As we watch, a spaceship passes us in time ∆t. The crew of the spaceship measures the passage time and finds it to be ∆tI . Which of the following statements is true?
A. ∆t is the proper time for the passage and it is smaller than ∆tI
B. ∆t is the proper time for the passage and it is greater than ∆t I
C. ∆tI is the proper time for the passage and it is smaller than ∆t
D. ∆t I is the proper time for the passage and it is greater than ∆t
E. of the above statements are true.
