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Chapter 1, Problem 30

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A Jiffy The American physical chemist Gilbert Newton Lewis $(1875-1946)$ proposed a unit of time called the “jiffy.” Accordingto Lewis, 1 jiffy $=$ the time it takes light to travel one centimeter.(a) If you perform a task in a jiffy, how much time has it taken inseconds? (b) How many jiffys are in one minute? (Use the fact thatthe speed of light is approximately $2.9979 times 10^{8} mathrm{m} / mathrm{s.} )$

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Transcript

and this problem. We’re looking at a unit of measurement called a jiffy, which is described as the amount of time it takes light to travel one centimeter. In order to figure out how long this is, we need to know what the speed of light is. And typically it’s beautiful and it’s called C, and it is equal to 2.9979 times 10 to the eighth meters per second. Now for part A. Here, we’re trying to find how long a jiffy is. So if we look at the time it takes light to travel one centimeter. Our first step should be to convert the speed of light into centimeters per second. We do this by noting that there are 100 centimeters in one meter, so the speed of light can then be defined as 2.9979 times, 10 to the 10th power centimeters per second. No. In order to…

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