Find the retarding potential required to stop electron of the de Broglie wavelength 0.5 nm

Explanation

To find the retarding potential required to stop an electron with a de Broglie wavelength of 0.5 nm, we can follow these steps:

### Step 1: Write the de Broglie wavelength formula
The de Broglie wavelength (\( \lambda \)) of a particle is given by the formula:
\[ \lambda = \frac{h}{\sqrt{2m e V}} \]
where:
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