Can photoelectric efficiency be greater than One `(1)` ?

Explanation

To determine whether photoelectric efficiency can be greater than one, we need to analyze the concept of efficiency in the context of the photoelectric effect.

### Step-by-Step Solution:

1. **Understanding Efficiency**:
- Efficiency (η) is defined as the ratio of useful output to the input. It is generally expressed as:
\[
\eta = \frac{\text{Output}}{\text{Input}}
...