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- Spring98

Which is the more reasonable measurement of the distance between the tracks on a CD:
1.6 • 10^–3 mm or 1.6 • 10^3 mm? Justify your answer.

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- Spring98

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- Spring98

@mathlover2014 can you plz help me? i will medal. :)

- welshfella

the distance between them is too small to be seen so its going to be a lot less than 1 mm

- welshfella

are you familiar with negative exponents?

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- Spring98

so is it this 1.6 • 10^3

- welshfella

No 10^3 = 1000 mm

- welshfella

10^-3 = 1/1000 or 0.001

- Spring98

1/1000right?

- welshfella

No - its one of the 2 options in your questiion.
The numbers I gave were only examples.

- welshfella

- to help you learn the difference between positive and negative exponents.

- Spring98

ya i know but the negative on will be to small so it will be 1.6 • 10^3 mm

- Spring98

@welshfella am i right?

- welshfella

NO 1.6 * 10^3 = 1,600 mm which is the same as 1.6 meters

- welshfella

check my first post

- Spring98

so the answer will be 1.6 • 10^–3 mm

- welshfella

yes

- Spring98

why?

- welshfella

well have a look at a CD . Can you see the distance between the tracks/

- Spring98

yes

- Spring98

@welshfella would it because the other one would be to big for the tracks of a CD?

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