A nonrelativistic particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is `1.813 xx 10^(-4)`. By calculating its mass, identify the particle.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Define the variables
Let:
- \( m \) = mass of the non-relativistic particle
- \( v \) = velocity of the non-relativistic particle
- \( v_e \) = velocity of the electron
- \( \lambda \) = de Broglie wavelength of the particle
...