Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

An electron of mass m with an initial velocity $\vec{v} = v_0\hat{i} (v_0 > 0)$ enters an electric field $\vec{E} = -E_0\hat{i} (E_0 = constant > 0)$ at t = 0. If $\lambda_0$ is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is (2018)
$\lambda_0 t$
$\lambda_0 \left(1 + \frac{eE_0}{mv_0}t\right)$
$\frac{\lambda_0}{\left(1 + \frac{eE_0}{mv_0}t\right)}$
$\lambda_0$

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