Answer : The correct option is, [tex]7.30\times 10^{-7}Km[/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 are :
- 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, 45.00 and 450.0 all have four significant figures.
- All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.
As per question,
[tex]7.30\times 10^{-7}Km[/tex] has 3 significant figures.
0.007 has 1 significant figure.
0.070 has 2 significant figures.
7077 has infinite significant figures.
Hence, the correct option is, [tex]7.30\times 10^{-7}Km[/tex]
