Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of: (2002)
Infrared rays
X-rays
Radio wave
Light wave

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:

If ultraviolet rays cannot induce the photoelectric effect, it means their frequency is below the threshold frequency. To cause emission, a radiation with a higher frequency (and higher photon energy) is needed. Among the options, only X-rays have a higher frequency and energy than ultraviolet rays.

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