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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 findsd that the average width of the hair in the field of view of the microscope is 3.5mm. What is his estimate on the thickness of hair?

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0.035mm
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NCERT TAMIL-UNITS AND MEASUREMENT-EXERCISE
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  2. Which of the following is the most precise devise 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. Answer the following : (a) You are given a tread and a metre scale. ...

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  5. Answer the following : (a) You are given a tread and a metre scale. ...

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  6. Answer the following : (a) You are given a tread and a metre scale. ...

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  8. The number of significant figures in 0.007 is

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  9. The numebr of significant figures in 2.64xx10^(4)kg is

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

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  11. State the number of significant figures in 6.032 J .

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  12. State the number of significant figures in 6.032 J .

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  13. State the number of significant figures in 6.032 J .

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  14. The length , breadth , and thickness of a metal sheet are 4.234 m , 1....

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  15. The mass of a box measured by a grocer's balance is 2.300kg. Two gold ...

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  16. A physical quantity P is related to four observables a, b, c and d as ...

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  17. A book with many printing errors contains four different forumlae for...

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  18. A famous relation in phyics relates the moving mass m to the rest mas...

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  19. The unit of length convenint on the atomic scales is known as an angst...

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  20. One mole of an ideal gas at NTP occupies 22.4 liters (molar volume). W...

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