How many significant figures are there in the following

values?

a. $0.05\times {10}^{-4}$ b. $0.00340$

c. $7.2\times {10}^4$ d.$103.00$

The non-zero digits which or if we write zeros after any non-zero digit then the digits are considered as meaningful and the digits can express the quantity accurately are called significant figures.

In the given digit $0.05\times {10}^{-4}$, as the leading zeroes are not considered as significant figure, there is only one significant figure that islocalid="1650548060723" $5.$

The zeroes that stand before any significant nonzero positive digit are considered as leading zeroes and the zeros stand after any non-zero digit are called trailing zeros.

In the given number $0.00340$, there are three leading zeros before the first significant digit localid="1650548077687" $3$. So, there are three significant figures including one trailing zero.

The non-zero digits are considered as the significant figures in a number consists of both zero and non-zero digits.

The given digit $7.2\times {10}^4$can be written as,$7.2\times {10}^4=72000$

So there are only two significant not zero figures as$7,2.$

In a decimal number, if there are zeros right after the decimal, then those zeros are considered as significant.

In the given number $103.00$, there are two trailing zeros right after the decimal and one zero is there between two non-zero digits. So there are total of five significant figures in this number.