PHYSICAL SCIENCE. CHAPTER 2 NOTES Mr. Wemhoff. Chapter 2 Notes.
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How were scientists able to measure the distance from the Earth to the Moon? They were able to use mirrors and lasers. They shot a laser at a reflective surface on the moon and then they recorded the time that it took for that laser to return back to the Earth. They know what the speed of light is and they know how long it took for the light to travel then they were able to calculate the distance in which the light traveled.
What is a light year?The distance in which light can travel in one year which is 9.5 trillion kilometers.
The nearest star is 4.2 light years away so how many kilometers away is this star? 39.9 trillion kilometers
Ex. if you have a measurement of 25 meters and you want to find out how many centimeters there are in that distance what will you have to do? How many decimal places will you have to move? Which direction will you have to move the decimal?
You need to move it over two places and to the right. 2500 cm
How many millimeters will there be in 25 meters? 25000 mm
How many kilometers are there in 25 meters? .025 Km