(1) Light: (a) What is the distance light travel in one year in unit of km? (b)
ID: 2013884 • Letter: #
Question
(1) Light: (a) What is the distance light travel in one year in unit of km? (b) How long does it take for light to leave the surface of Sun and reach the surface of the Earth?(2) When a diver directs a beam up to the air/water interface at an angle of 30 degrees from the normal, determine where the light will go upon reaching the interface? Illustrate your results. (Consider both reflection and refraction).
(3) When the same diver changes the direction of his light beam to 80 degrees from the normal, determine where the light will go upon reaching the interface? Illustrate your results. (Consider both reflectiona nd refraction).
Explanation / Answer
(a) Speed of light is c = 3.0x108 m/s One year is t = 31557600 s The distance traveled in one year is d = c * t = 94672800x108 m = 94.6728x1011 km (b)The separation between sun and earth is d = 1.50x108 km = 1.50x1011 km Then the time taken to travel the distance d is t = d / c = 1.50x1011 km / (3.0x108 m/s) = 500 s = 8.33 minRelated Questions
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