The voltage applied to an X-ray tube is 20 kV. The minimum wavelength of X-ray produced, is given by `(31xxn)/50 Å` then n will be
(`h=6.62xx10^(-34) Jx,c=3xx10^(8) m//s, e=1.6xx10^(-19)` coulomb):

Explanation

To solve the problem, we need to find the value of \( n \) given that the minimum wavelength of X-ray produced is expressed as \( \frac{31n}{50} \) Å and the voltage applied to the X-ray tube is 20 kV.

### Step-by-Step Solution:

1. **Convert Voltage to Volts**:
The voltage given is 20 kV. We need to convert this into volts:
\[
V = 20 \text{ kV} = 20 \times 10^3 \text{ V} = 20000 \text{ V}
...