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  4. The number of significant figures in 3400 is :

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Q. The number of significant figures in $3400$ is :

AFMCAFMC 2000

Solution:

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.