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If you are travelling just below the speed of light and you shine a torch in front of you what happens?

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Peter D asked:


If you are travelling just below the speed of light and you shine a torch in front of you what happens? Does it travel at your speed plus the speed of light or does the light appear to move very slowly away from you? Also if you turn around and shine it backwards would the light appear to be travelling as almost twice the speed of light away from you?

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This entry was written by imhar and posted on December 17, 2008 at 10:48 pm and filed under Physics. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment(Latest is displayed first) or leave a trackback: Trackback URL.

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3 Comments so far (Add 1 more)

  1. All observers observe all light rays to travel at c. The torch works exactly the same regardless of your motion.

    1. Prof. Zikzak on December 22nd, 2008 at 8:15 pm

  2. According to relativity, the light will appear to race away from you at the speed of light. Some one watching you from the earth, would see you travelling fairly close to the front of beam near the speed of light. The key is that time for you changes so that both statements seem true – the famous analogy of your clock being slower so the distance travelled by your flashlight beam in a ’second’ is the same distance as if you were relatively still (with faster relative time).

    2. D_Barber on December 21st, 2008 at 2:56 am

  3. according to Einstein’s theory of relativity, the speed of light is a constant, so it would appear to move slower if you shined it in front of you, and faster if you shined it behind. This would also change the apparent color of the light to you as the observer (sort of like the doppler effect, but here it’s the thing in motion that is affected).

    3. hylobius on December 20th, 2008 at 10:05 pm

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