Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
Magnification of the microscope = 100
Average width of the hair in the field of view of the microscope = 3.5 mm
`"Actual thickness" = "Observed width"/"Magnification"`
= `(3.5 "mm")/100`
= 0.035 mm
APPEARS IN
संबंधित प्रश्न
What do you mean by significant figures?
How many significant figures are present in the 0.0025?
How many significant figures are present in the 5005?
Round up the following upto three significant figures:
34.216
You are given a thread and a metre scale. How will you estimate the diameter of the thread?
A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?
State the number of significant figures in the following:
0.2370 g cm–3
Solve the numerical example.
The diameter of a sphere is 2.14 cm. Calculate the volume of the sphere to the correct number of significant figures.
Write a short note on the following.
Rounding - off
How many significant figures should be present in the answer of the following calculations?
`(2.5 xx 1.25 xx 3.5)/2.01`
Assertion (A): Significant figures for 0.200 is 3 where as for 200 it is 1.
Reason (R): Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.
The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is ______.
How many significant figures are present in the measurement 2007 grams?
Which of the following measurements has exactly two significant figures?
Which of the following measurements contains exactly two significant figures?
A length L is measured as 125 m, which is also written as 12500 cm and 125000 mm. How many significant figures does this measurement have?
