An electron moves through a region of uniform electric potential of -200 V with a (total) energy of 500 eV. What are its (a) kinetic energy (in electron-volts), (b) momentum, (c) speed, (d) de Broglie wavelength, and (e) angular wave number?

Explanation

To solve the problem step by step, we will analyze the given information and use relevant physics equations.

### Given:
- Electric potential (V) = -200 V
- Total energy (E_total) = 500 eV
- Charge of an electron (e) = 1.6 x 10^-19 C (but we will use it in eV)

### Step 1: Calculate the Potential Energy (PE)
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