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4 10 points You send a flash of light toward the Moon. It bounces off a mirror and returns to you. You measure the time between when you sent the flash and when it returns to you and find that the whole process took 2.0 seconds. The distance to the Moon is (state your answer in kilometers and list the answer with at least three significant figures.) You can use 3x108 m/s as the speed of light (feel free to google this quantity to verify) Type your answer... 5 10 points The distance from the Sun to the Earth is about 150 million kilometers. Suppose in some catastrophe that the Sun suddenly turned off all its light output. How much time would pass between when the Sun stopped and when we would see it happen on Earth? State your time in minutes and to one decimal place accuracy Type your answer..

10 points You use a pinhole camera to take a picture of a small tree. The tree is 8.1 meters away from the camera and the tree is 2.6 meters high. Your pinhole camera is a cubical box that is 11 centimeters deep from the pinhole and 11 centimeters high and wide. The image of the tree in the pinhole camera is upside down. 8 For a pinho e camera, the rat o o the size o an ob ect to the distance rom the object to the camera must be equa to the ratio o te size of the pinho e mage o the depth of the pinhole camera. Use the relationship above to determine the size of the trees image in centimeters to one decimal place accuracy. Type your answer... 10 points If I want to increase the size of a pinhole image on the back of a pinhole camera, which of the following could accomplish that goal? Move the pinhole closer to the object Move the pinhole farther from the object Move the back of the pinhole camera towards the pinhole (.e., make the camera smaller) Move the back of the pinhole camera away from the pinhole (.e., make the camera larger) Increase the size of the pinhole Decrease the size of the pinhole

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Answer #1

C. as it goes ロぐTotal distance will be twice the distance to the moon as the lifht goes and returns.

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