State the number of significant figures in the following measurements :
(i) `1.60xx10^(9)kg`
(ii) `7.036J`
(iii) `0.0003s`.

Explanation

To determine the number of significant figures in the given measurements, we will analyze each measurement step by step.

### Step 1: Analyze the first measurement `1.60 x 10^(9) kg`
- The number is in scientific notation, where `1.60` is the coefficient and `10^(9)` is the power of ten.
- In scientific notation, all non-zero digits are significant.
- The digits `1`, `6`, and `0` in `1.60` are significant.
- Therefore, the total number of significant figures in `1.60 x 10^(9) kg` is **3**.

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