To determine which symbol makes the statement true, we need to compare \( 5 \times 10^{-11} \) and \( 3 \times 10^{-11} \).
Both numbers are in scientific notation. We can compare the coefficients (5 and 3) because they both have the same exponent (-11).
Since \( 5 > 3 \), we have:
\( 5 \times 10^{-11} > 3 \times 10^{-11} \).
So, the correct symbol to fill in the blank is \( > \).
The complete statement is:
\( 5 \times 10^{-11} > 3 \times 10^{-11} \).