Significant figures in the measured value of a physical quantity tell the number of digits
Channel: Doubtnut
Date: 26/07/2020

Significant figures in the measured value of a physical quantity tell the number of digits in which we have confidence. Larger the number of significant figures obtained in a measurement, greater is the accuracy of measurement and vice-verse, In addition  or subtraction, the number  of decimal places in the result should equal the smallest number of decimal places in any term in the operation. In multiplication and division, the number of significant figures in the product or in the quotient is the same as the smallest number of significant figures in any of the factors. With the help of the comprehension given above, choose the most appropriate alternative for each of the following questions :  Add `3.8 xx10^(-6) to 4.2 x10^(-5)` with due regard to significant figures