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A student measures the thickness of a hu...

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 in the field of view of the microscope is 3.5 mm. What is the estimate on the thickness of hair ?

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0.035mm
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NCERT GUJARATI-UNITS AND MEASUREMENT-EXERCISE
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  2. Which of the following is the most precise device for measuring length...

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  3. A student measures the thickness of a human hair by looking at it thro...

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  4. You are given a thread and a metre scale. How will you estimate the di...

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  6. The mean diameter of a thin brass rod is to be measured by vernier cal...

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  7. The photograph of a house occupies an area of 1.75 cm^(2) on a 35 mm s...

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  8. State the number of significant 0.007 m^(2)

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  9. State the number of significant 2.64xx10^(24) kg

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  10. State the number of significant 0.2370 g cm^(-3)

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  19. The principle of 'parallax' in section 2.3.1 is used in the determinat...

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