The result of computation with approximate numbers, which contain more than one uncertain digit should be rounded off. Rules For Rounding Off 1. If the digit to be dropped is less than 5, then the preceding digit is left changed. Example:- X = 7.82 is rounded off 7.8 2. If the digit to be dropped […]
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The significant figures are normally the measurement of a number that includes all digits in the number that is known reliably plus first digit that is uncertain. The digit that are known reliably plus the first uncertain digit are known as significant figures or digits. Example:- let a measured distance is reported as 374.5 m.
When we perform the mathematical operations, such as addition, subtraction, division, multiplication etc, the error combination depends on the type of mathematical operation performed on physical quantities. 1. Error In Sum Of Two Quantities Let ∆A and ∆B be the absolute errors in the two quantities A and B respectively, then Hence, The maximum possible
To measure any physical quantity, we compare it with a standard unit of that quantity. No measurement is perfect as the error involved in the process, can not be removed completely. So the difference in the true value and the measured value of a quantity is called error of measurement. Error = True Value –
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Accuracy The accuracy of a measurement is a measure of how close the measured value is to the true value of the quantity. It refers to the closeness of a measurement to the true value of the physical quantity. As we reduce the errors, the measurement becomes more accurate. Precision Precision tells us to what
