Question

Which of these measurements is expressed to four significant figures?

Answer 1

Answer: The answer is d. 16.530 m with 4 significant figures

Step-by-step explanation:

Significant figures  are the digits that contribute meaning in the expression

In the given options

a. $2.6\times 10^4$

Here only 2 and 6 are counted as significant digits

b.$5.300\times 10^{-7}$

Here Since the zeros are after decimal So they will not be counted in significant figure i.e. S fig =2

c. 0.108

Here No of significant figures will be 3

d. 16.530

Here the no of significant figures are 4 i.e 1 6 5 3

So the answer is  d.16.530

Answer 2

5.300 x 10-7 m this is the correct answer 100% so B