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(4 marks) Yuchong got kidnapped by an alien spaceship. The spaceship immediately left the earth heading towards the nearest star, Proxima Centauri,...
1. (4 marks) Yuchong got kidnapped by an alien spaceship. The spaceship immediately left the earth heading towards the nearest star, Proxima Centauri, at a constant speed of 0.5c. Upon arrival, how many years would have passed on the earth?
2. (4 marks) While Yuchong was onboard the spaceship, what was the distance between Proxima Centauri and the earth as seen by Yuchong?
3. (4 marks) The PHY100 students on the earth missed Yuchong, and sent him a message using radio waves. The bad aliens did not allow Yuchong to reply, so the students sent another message exactly one day after the first message. What would be the time gap between the two messages as seen by the aliens on the spaceship?
4. (4 marks) Upon arrival, how much time would have passed on the spaceship?
