Problem 48P

Correct any entries in the table that are wrong.

Quantity |
Significant Figures |

(a) 24 days |
2 |

(b) 5.6 × 10−12 s |
3 |

(c) 3.14 m |
3 |

(d) 0.00383 g |
5 |

Solution: Here, we are going to identify the wrong entry of the significant figures in the given table.

Step1:

The following rules are followed to count the number of significant figures in a particular number:

- All non-zero digits are significant.
- Zeroes between two non zero digits are significant.
- The zeroes preceding to the first non zero number(i.e., to the left of the first non zero number) are not significant.
- All zeroes placed at the end or to the right of a number are significant provided they are on the right side of the decimal point.
- In exponential notations, the numerical portion represents the number of significant figures.

Step2:

Based on the rules given above, we can say that two of the entries given in the table are wrong.

b) 5.6 x 10-12 s has two significant figures [Rule 5]

d) 0.00383 g has three significant figures [Rule 3]

------------------