Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Photoelectric Effects and deBroglie Equation. Understanding the underlying formula is key to arriving at the correct answer below:

In a discharge tube, a high potential difference accelerates free electrons (cathode rays) to high speeds. The ionization of the enclosed gas is primarily caused by the energetic collisions between these rapidly moving negative electrons and the neutral gas atoms or molecules.