A CD has a small radius of 25 mm and a larger radius of 58mm. The tracks on the CD are 0.5micro meter thick and 1.6 micrometer apart.

Q1) How many tracks are there?

Q2) Prove that the total length of the tracks is 5km.

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Q1) How many tracks are there?

Q2) Prove that the total length of the tracks is 5km.

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