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:

Cathode rays are streams of fast-moving electrons, which are negatively charged particles. Because they carry an electric charge, they are readily deflected by both electric and magnetic fields. Therefore, the statement that they do not deflect in an electric field is incorrect.