How many significant figures are there is each of the following numberS?
(i) 123 g (ii) 0.123 m (iii) 0.0456 g (iv) `1.20xx10^(3)W`

Explanation

To determine the number of significant figures in each of the given numbers, we will apply the rules of significant figures. Here’s a step-by-step breakdown:

### Step 1: Analyze the number 123 g
- **Rule**: All non-zero digits are significant.
- **Analysis**: The digits are 1, 2, and 3, which are all non-zero.
- **Conclusion**: There are **3 significant figures** in 123 g.

### Step 2: Analyze the number 0.123 m
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