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A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair is $3.5 mm$ . What is thickness of the hair?

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0.0035 mm

0.035 mm

0.01 mm

0.7 mm

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detailed solution

Correct option is B

Magnification is 100. Hence, the thickness of hairt=3.5100=0.035 mm

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A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair is 3.5 mm. What is thickness of the hair?

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Ready to Test Your Skills?

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A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair is $3.5 mm$ . What is thickness of the hair?