Answer: [tex]7.30\times 10^{-7}[/tex]
Explanation :
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
Digits from 1 to 9 are always significant and have infinite number of significant figures.
All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
All zero’s after the decimal point are always significant. For example: 4.500 have four significant figures.
All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.
1. 0.007 has one significant figure.
2. 7077 has four significant figures.
3. [tex]7.30\times 10^{-7}[/tex] has three significant figures.
4. 0.070 has two significant figures.
