The number of significant figures for the three numbers 193 cm, 0.193 cm, 0.0193 cm are:

3, 3 and 3 respectively

The correct answer is option 2. 3, 3 and 3 respectively.

To determine the number of significant figures in a number:

A. All non-zero digits are significant.
B. Any zeros between non-zero digits are significant.
C. Leading zeros (zeros to the left of the first non-zero digit) are not significant.
D. Trailing zeros (zeros to the right of the last non-zero digit) in a number containing a decimal point are significant.

Let's apply these rules to the given numbers:

\(193\) cm:

All digits are non-zero, so all are significant.

Number of significant figures = \(3\).

\(0.193\) cm:

All digits are non-zero, so all are significant.

Number of significant figures = \(3\).

\(0.0193\) cm:

Leading zeros are not significant.

All other digits are non-zero, so they are significant.

Number of significant figures = \(3\).

So, the correct answer is: (2) \(3\), \(3\) and \(3\) respectively