1. The speed of light is now defined to be 299,792,458 m/s. What is the approximate relative error in taking m/s?

   

   How many miles does light travel in a millisecond?

   

   How many times around the earth can light travel in a second?

   

   The nearest star outside the solar system is 4 light-years away. How many miles is it to the star?

   

   What difference would it make in the time for light to get to us from Centauri if the figure for c differed by 1 m/s - that is if it were 299,792,457 m/s instead of 299,892,458 m/s?

   

   A light signal traveling at 299,792,458 m/s are sent and some other signal travelling at 299,792,457 ``m/s'' are sent from New York to San Francisco, a distance of about 4800 km. How far is the light signal ahead of the other signal when they arrive in San Francisco?

   

2. The radius of the earth's orbit around the sun is m. Find its period in seconds and evaluate v/c, its speed relative to the speed of light. (One year is 365.24 days.)

   

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