A potential diffrence , the `20kv` is applied across an X- ray s tube . The minimum wavelength of x- ray generated is …….` Å` .

Explanation

To solve the problem of finding the minimum wavelength of X-rays generated when a potential difference of 20 kV is applied across an X-ray tube, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between energy and wavelength**:
The energy (E) of the X-ray photon can be expressed in terms of its wavelength (λ) using the equation:
\[
E = \frac{hc}{\lambda}
...