Which of the following has the least number of significant figures?

1.	Which of the following has the least number of significant figures?
Answer» `1.64 XX 10^(20)` kg `0.006 m^(2)` 7.2180 J 5.045 J Solution :According to the rules of significant figures, 1.64 x 1020 kg has three significant figures. 0.006 m2 has one significant figures. 7.2180 J has FIVE significant figures. 5.045 J has FOUR significant figures.

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