1.show that it would take 2.5 s for a pulse of laser light to reach the Moon and
ID: 2018889 • Letter: 1
Question
1.show that it would take 2.5 s for a pulse of laser light to reach the Moon and to bounce back to Earth.
2. A ball with the same diameter as a lightbulb is held halfway between the bulb and a wall, as shown in the sketch. Construct light rays (similar to those in figure 26.14, conceptual physics, 11th edition) and show that the diameter of the umbra on the wall is the same as the diameter of the ball and that the diameter of the penumbra is 3 times the diameter of the ball.
3.show with a simple diagram that when a mirror with a fixed beam incident upon it is rotated through a certain angle, the reflected beam is rotated through an angle twice as large. (this doubling of displacement makes irregulaities in ordinary window glass more evident.)
4.when lights strikes glass perpendicularly, about 4% is reflected at each surface. show that 92% of light is transmitted through a pane of window glass.
Explanation / Answer
1. The average distance between Earth and Moon is , d = 3.8 *10^8 m Total distance travelled by the light is 2d = 7.6 *10^8 m Speed of light is, v = 3 *10^8 m/s Time taken , t = d / v = (7.6 *10^8 m/s) / 3 *10^8 m/s t = 2.5 s Thus, it takes 2.5 s for the pulse of laser light to reach the Moon and to bounce back to Earth *Post only one question for single post *Related Questions
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