The wavelength of a spectral line is measured as $589.3 \pm 0.2$ nm. What is the wavelength expressed with the correct number of significant figures and its uncertainty?

A student calculates the volume of a sphere to be $4.1887902047863905 imes 10^3 cm^3$. If the radius measurement used in the calculation has only two significant figures, what is the correctly rounded volume?

If $L = 2.331\;cm,\;B = 2.1\;cm,$ then L+B=

A current of 2..34 A flows in a resistance of 11.111111${\rm{\Omega }}$. The potential difference across the given resistance with due regard for significant figure is

The value of Avogadro's number is $6.02214076 imes 10^{23}$. For a calculation requiring only three significant figures, what value of Avogadro's number should be used?

A current of 2..34 A flows in a resistance of 11.111111${\rm{\Omega }}$. The potential difference across the given resistance with due regard for significant figure is

Round 0.037 to two decimal places.

In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct

(1) Out of the two measurements 50.14 cm and 0.00025 ampere, the first one has greater accuracy

(2) If one travels 478 km by rail and 397 m by road, the total distance travelled is 478 km

A student measures two lengths as $2.99$ m and $0.0099$ m. What is the sum of these lengths, taking into account significant figures?

What is 15.48 rounded to one decimal place?

The length, breadth and thickness of a block are given by $l = 12cm,\;b = 6\;cm\;$ and $\;t = 2.45cm$ The volume of block according to the idea of significant figures should be