A) 7
B) 6
C) 12
D) 2
Correct Answer: D
Solution :
Key Idea: Significant figures in the measured value of a physical quantity tell the number of digits in which we have confidence. The hypothetical idea of significant figures also called significant digits is a method of expressing error in measurement. Significant figures conventionally follow certain set of rules. All non-zero digit are significant. Zero after the last non-zero-digit number are not significant, hence 3400 has two significant digits.
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