4. Graphite is made up of layers of graphene. Each layer of graphene is about 200 picameters, or $200 \times 10^{-12}$ meters, thick. How many layers of graphene are there in a 1.6-mm-thick piece of graphite? Express your answer in scientific notation.
(From Unit 7, Lesson 14.)

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$\boxed{8.00 \times 10^3}$ layers of graphene in a 1.6-mm-thick piece of graphite.

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Step 1 ：Convert the thickness of the graphite piece to picometers: $1.6 \text{ mm} = 1.6 \times 10^6 \text{ pm}$

Step 2 ：Divide the thickness of the graphite piece by the thickness of one graphene layer: $\frac{1.6 \times 10^6 \text{ pm}}{200 \text{ pm}} = 8 \times 10^3$

Step 3 ：$\boxed{8.00 \times 10^3}$ layers of graphene in a 1.6-mm-thick piece of graphite.

4. Graphite is made up of layers of graphene. Each layer of graphene is about 200 picameters, or $200 \times 10^{-12}$ meters, thick. How many layers of graphene are there in a 1.6-mm-thick piece of graphite? Express your answer in scientific notation.(From Unit 7, Lesson 14.)

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4. Graphite is made up of layers of graphene. Each layer of graphene is about 200 picameters, or $200 \times 10^{-12}$ meters, thick. How many layers of graphene are there in a 1.6-mm-thick piece of graphite? Express your answer in scientific notation.
(From Unit 7, Lesson 14.)