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:

J.J. Thomson discovered the electron and determined its specific charge (the charge-to-mass ratio, $e/m$ ). Once Robert Millikan independently measured the fundamental charge ( $e$ ), Thomson's ratio allowed for the indirect evaluation of the electron's mass.