The distance between earth and sun is 92.96 million miles. What is the distance in meters? (1 mi = 1.609 km) the speed of light is . If the sun explodes, how many minutes does it take for the first beam of light in this explosion to reach earth?
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The speed of light in a vacuum is exactly 299,792,458 m/s. This speed is sometimes used to provide a convenient yardstick for large astronomical distances. (a) A light-second is the distance light travels in one second. If the Moon is 3.84×108 m from the Earth (center to center), how many light-seconds away is it? (b) A light-minute is the distance light travels in one minute. If the Earth is 1.50×1011 m from the Sun, how many light-minutes away is it? (Your answer also represents the number of minutes it takes for light to reach the Earth from the Sun.) (c) A light-year is the distance light travels in one year. The Sun is 28,000 light-years from the center of the Milky Way galaxy. What is this distance in meters?
The average distance between Earth and the Sun is 1.5 x 1011 m.
(a) Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. (b) What is this speed in miles per hour?
(1) Light: (a) What is the distance light travel in one year inunit of km? (b) How long does it take for light to leave thesurface of Sun and reach the surface of the Earth?(2) When a diver directs a beam up to the air/water interface at anangle of 30 degrees from the normal, determine where the light willgo upon reaching the interface? Illustrate your results. (Considerboth reflection and refraction).(3) When the same diver changes the direction of his light beam to80 degrees from the normal, determine where the light will go uponreaching the interface? Illustrate your results. (Consider bothreflectiona nd refraction).
