Quiz: Time Dilation: The Relativity of Time

Question 1

If two observers measure the time between two events and one is moving relative to the other at a significant fraction of the speed of light, what phenomenon will occur?

Accepted Answer

The moving observer will measure a shorter time interval

Answer

The moving observer will measure a longer time interval

Answer

Both observers will measure the same time interval

Answer

Time will stop for the moving observer

Question 2

A spaceship travels at 0.8c relative to Earth. How much time passes on Earth when 10 years pass on the spaceship?

Accepted Answer

12.5 years

Answer

6.25 years

Answer

18 years

Answer

20 years

Question 3

Which scenario does NOT involve time dilation?

Accepted Answer

A clock in a stationary laboratory runs at the same rate as a clock in a moving laboratory

Answer

A clock on a fast-moving satellite runs slower than a clock on Earth

Answer

A clock at the top of a tall building runs faster than a clock at the bottom

Answer

A clock underwater runs at a different rate than a clock in the air

Question 4

In the twin paradox, one twin travels in a spaceship at relativistic speeds and returns to Earth. What happens to the traveling twin compared to the Earth-bound twin?

Accepted Answer

The traveling twin ages less than the Earth-bound twin

Answer

The traveling twin ages more than the Earth-bound twin

Answer

Both twins age at the same rate

Answer

The twin who traveled becomes younger and then older upon return

Question 5

If a muon is created in the upper atmosphere and has a rest lifetime of 2.2 μs, but due to its high velocity (0.998c) it reaches the Earth's surface, what is the primary reason it doesn’t decay before arrival?

Accepted Answer

From the Earth's frame, its lifetime is dilated

Answer

It changes its speed upon entering the atmosphere

Answer

From the muon's frame, the distance to Earth is contracted

Answer

It is protected by the Earth's magnetic field

Question 6

When considering both special and general relativity, which factor does NOT contribute to time dilation?

Accepted Answer

Mass of the observers

Answer

Relative velocity between observers

Answer

Gravitational potential difference

Answer

Altitude above Earth’s surface