Question

Write down the number of significant
figures in the following: 0.003 m²,
0.1250 gm cm, 6.4 x 10 m, 1.6 x 10-19
C, 9.1 x 10-31 kg.
[Ans: 1, 4, 2, 2, 2]​

Answer 1

Answer:

1, 4, 2, 2, 2

Explanation:

Given,

(1) 0.003 m² = 3 x 10^-3 {Significant Digit: 3 => No. of significance: 1}

(2) 0.1250 gm = 125.0 x 10^-3 {Significant Digit: 125.0 => No. of significance: 4}

(3) 6.4 x 10 m = 64 m {Significant Digit: 64 => No. of significance: 2}

(4) 1.6 x 10^-19 C = 16 x 10^-20 {Significant Digit: 16 => No. of significance: 2}

(5) 9.1 x 10-31 kg = 91 x 10^-32 {Significant Digit: 16 => No. of significance: 2}

Significant Figures

All non-zero numbers ARE significant. ...

Zeros between two non-zero digits ARE significant. ...

Leading zeros are NOT significant. ...

Trailing zeros to the right of the decimal ARE significant. ...

Trailing zeros in a whole number with the decimal shown ARE significant.