A 30-year-old woman takes a trip on a rocket, leaving her ...

[Marty]

A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
 a. 2 years younger
  b. 2 years older
  c. 3 years older
  d. 10 years older
  e. 8 years older

Question 2

A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
 a. 13.4 s
  b. 16.7 s
  c. 12.5 s
  d. 9.70 s
  e. 6.03 s

[cam1229]

Answer to Question 1

B

Answer to Question 2

B

[Marty]

Thanks for the timely response, appreciate it

[kilada]

Excellent