7.Question 7Consider two identical light clocks, designed as explained in lecture. Bob has one, and Alice takes the other on her spaceship and flies by Bob at speed V. Bob observes Alice’s clock as Alice flies by. Which of the following statements is true?1 pointBob observes Alice’s clock to tick faster than his clock.Bob observes Alice’s clock to tick at the same rate as his clock.Bob observes Alice’s clock to tick slower than his clock.

3.Question 3Consider the twin paradox example done in lecture: On Alice's return trip from the star back to Bob, Bob observes Alice's clocks running slower than his clocks. What does Alice observe regarding Bob's clocks?1 pointAlice observes Bob's clocks running slower than her clocks.Alice observes Bob's clocks running at the same rate as her clocks.Alice observes Bob's clocks running faster than her clocks.

9.Question 9Consider two identical light clocks, designed as explained in lecture. Bob has one, and Alice takes the other on her spaceship and flies by Bob at speed V. Bob observes Alice’s clock. What is the relationship between a certain amount of elapsed time on Bob’s clock and the corresponding elapsed time on Alice’s clock, as observed by Bob (where γ represents the Lorentz factor)? 1 pointThe elapsed time on Alice’s clock = γ times the elapsed time on Bob’s clock.The elapsed time on Alice’s clock = (1/γ) times the elapsed time on Bob’s clock.The elapsed time on Alice’s clock = the elapsed time on Bob’s clock.

9.Question 9In the twin paradox example done in lecture, just after Alice leaves the star on her return trip (and she's back up to her cruising speed of 0.6c), she observes Bob's clock back where he is located. (In other words, she has a photo taken of his clock and her corresponding clock at that location, her clock being part of her lattice of clocks.) Compared to her clock, does she observe Bob's clock to be behind, ahead, or the same time as hers?1 pointBob's clock is behind her clock.Bob's clock is ahead of her clock.Bob's clock has the same time as her clock.

10.Question 10In the twin paradox example done in lecture, how does Alice explain the fact that when she returns, Bob has aged more than she has, even though on both legs of her trip when she was traveling at 0.6c she observed his clocks to run more slowly than hers?1 pointDue to the finite speed of light, there is a delay in when Alice sees the reading on one of Bob's clocks, which means that Alice's observation of Bob's clocks running slow is incorrect.When she turned around at the star, she changed her frame of reference, which led to his clocks jumping ahead of hers (from her perspective).Though it seemed to Alice as if Bob's clocks were running slower than hers, they were actually running faster throughout the whole trip.

8.Question 8In the "pole in the barn" example done in lecture, how can Bob observe/photograph the front of the pole to be located at the rear door of the barn at 44.4 nanoseconds and the rear of the pole to be located at the front door of the barn at 44.4 nanoseconds (so the entire pole is in the barn), while Alice agrees with Bob's clock readings but never herself observes the pole to be entirely within the barn?1 pointBecause Alice observes Bob's clocks to be unsynchronized, with the rear door photo occurring first and the front door later.Because when Bob synchronized his clocks he forgot to take into account that light travels at a finite speed.Because Bob's crazy.