Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by (2011 Pre)
Increasing the potential difference between the anode and filament
Increasing the filament current
Decreasing the filament current
Decreasing the potential difference between the anode and filament

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:

The velocity of electrons is determined by the accelerating voltage. Therefore, increasing the potential difference between the anode and the filament increases the kinetic energy and hence the velocity of the emitted electrons.

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