Photoelectric Effects and deBroglie Equation: Practice Problem & Solution
An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. Its final velocity will be (1996)
Short Solution (Best for NEET):
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 kinetic energy gained by the electron is equal to the work done by the electric field: $\frac{1}{2}mv^2 = eV$. Rearranging for velocity gives $v = \sqrt{\frac{2eV}{m}}$.
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