VIDEO QUIZ

Watch. Think.
Make Connections.

Choose a video quiz from the library or open the one your teacher assigned. Watch carefully, use video evidence to answer each question, and review your results.

Learning target: I can support my answers with evidence from a video.

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VIDEO LEARNING

Speed Of Light

Show what you learned from the video.

15 QUESTIONSAUTOMATICALLY GRADED

First, tell us who you are

1What is a photon clock?
2According to Einstein, how does a photon clock look when observed from outside a moving spaceship compared to inside?
3What happens to the ticking rate of real physical clocks when they move at very high speeds?
4True or False: The speed of light is the same in all reference frames.
5What happens to the half-life of muons traveling close to the speed of light?
6Why can't objects be accelerated to the speed of light?
7What is the 'proper time' in relativity?
8What is the 'dilated time'?
9How is the factor 'gamma' related to speed in time dilation?
10At 87% of the speed of light, what is the approximate value of gamma and the corresponding time dilation effect?
11If a spaceship accelerates at a constant force outward and approaches light speed, how does outside observers perceive its acceleration?
12Why does increasing the fuel output at high speeds not allow a spaceship to reach the speed of light faster?
13True or False: Experiments with atomic clocks on airplanes confirm time dilation predictions.
14What fundamental postulate does all of special relativity, including time dilation, depend on?
15What causes the time dilation effect physically, according to the photon clock analogy?

How to use this video quiz

Video quiz: directions & next steps

Use the video quiz to check your understanding of the assigned video. Read the current directions on this page before you begin, because the activity or available choices may change.

Before you begin

Confirm which video your teacher has assigned. Watch carefully and notice the details that support the questions on this page.

Work through the task

Read each prompt and select the answer supported by the video. If your teacher allows reviewing the clip, return to the relevant moment before deciding.

Check your work

Check that you answered the required questions and entered any requested class information. Follow the submission directions displayed by the quiz.

What happens next?

Use the result as feedback about your understanding. Revisit a confusing idea and be ready to explain the evidence that supports an answer.

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