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Question

The size of a human hair strand is about 0.12 mm. Express it in the unit of angstrom.
  1. 1200000

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Solution

The correct option is A 1200000
1 angstrom = 1010 m

1 metre = 1000 mm = 103 mm

So, 1 angstrom = 1010×103 mm=107 mm

In other words, 1 mm=107 angstrom

Given, the size of a human hair strand = 0.12 mm

0.12×107 angstrom
12×105 angstrom
12,00,000 angstrom

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