Find the number of significant figures in the following constants:
(i) `6.626 xx 10^(-34)` Js (Planck's constant)
(ii) `6.02 xx 10^(23)` (Avogadro's number)
(iii) `1.097 xx 10^5 cm^(-1)` (Rydberg's constant).
(iv) `5.29 xx 10^(-9)` cm (First Bohr's radius in H)

Explanation

To find the number of significant figures in the given constants, we will analyze each constant one by one.

### Step-by-Step Solution:

1. **Planck's Constant: `6.626 x 10^(-34) Js`**
- The significant figures are determined by the digits in the number before the exponent.
- The digits `6`, `6`, `2`, and `6` are all non-zero digits, which are significant.
- Therefore, the total number of significant figures in Planck's constant is **4**.
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