Calculate de Broglie wavelength associated with an electron, accelerated through a potential difference of `400 V`.

Explanation

To calculate the de Broglie wavelength associated with an electron that has been accelerated through a potential difference of 400 V, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the de Broglie Wavelength Formula**:
The de Broglie wavelength (\( \lambda \)) is given by the formula:
\[
\lambda = \frac{h}{mv}
...