The ratio of the intensities of two interfering waves is 81:1. What is the ratio of the maximum to minimum intensity?

Explanation

To solve the problem, we need to find the ratio of the maximum intensity to the minimum intensity of two interfering waves, given the ratio of their intensities is 81:1.

### Step-by-Step Solution:

1. **Understanding the Relationship Between Intensity and Amplitude**:
- The intensity (I) of a wave is directly proportional to the square of its amplitude (A). This can be expressed as:
\[
I \propto A^2
...