For a given kinetic energy, which of the following has the smallest de Broglie wavelength : electron, proton and `alpha-particle`?

Explanation

To determine which particle has the smallest de Broglie wavelength for a given kinetic energy, we can follow these steps:

### Step 1: Understand the de Broglie wavelength formula
The de Broglie wavelength (\( \lambda \)) is given by the formula:
\[ \lambda = \frac{h}{\sqrt{2mK}} \]
where:
...