All GRE Subject Test: Physics Resources
Example Questions
Example Question #1 : Special Relativity
At one point in time, two twins are 30 years old. At this time, one of them gets on a rocket and travels at 0.8 c, for what he experiences to be 12 years. How old is the twin that remained on Earth when the traveling twin returns home?
Possible Answers:
42 years old
37 years old
50 years old
70 years old
Correct answer:
50 years old
Explanation:
The equation for time dilation is given by:
In this problem v=0.8c T=12. Using this equation, we get:
Adding 20 years to the age initial age of 30:
The Earth-twin is now 50.
Yoonsik
Certified Tutor
Certified Tutor
Seoul National University, Bachelor of Science, Physics. University of Pennsylvania, Doctor of Philosophy, Atomic and Molecul...
All GRE Subject Test: Physics Resources
Popular Subjects
French Tutors in Phoenix, GMAT Tutors in Phoenix, Computer Science Tutors in Dallas Fort Worth, Algebra Tutors in Denver, ACT Tutors in Phoenix, Math Tutors in Denver, SAT Tutors in Washington DC, Spanish Tutors in Philadelphia, GRE Tutors in Seattle, GRE Tutors in Miami
Popular Courses & Classes
Spanish Courses & Classes in Atlanta, SSAT Courses & Classes in San Francisco-Bay Area, SSAT Courses & Classes in Philadelphia, Spanish Courses & Classes in Chicago, SAT Courses & Classes in Philadelphia, GMAT Courses & Classes in San Diego, SSAT Courses & Classes in Washington DC, GMAT Courses & Classes in Phoenix, LSAT Courses & Classes in Seattle, SAT Courses & Classes in Denver