JEE Main 2026 (5 Apr, Shift 1) Physics Q35: Matter Waves

Question

An electron of mass $m$ is moving in an electric field $\vec{E} = -2E_0\hat{i}$ ($E_0$ = constant $> 0$), with an initial velocity $\vec{V} = v_0\hat{i}$ ($v_0$ = constant $> 0$). If $\lambda_0 = \frac{h}{4mv_0}$, its de Broglie wavelength at time $t$ is ________.
($e$ = charge of electron)

Accepted Answer

Option 3: $\frac{4\lambda_0}{\left[1 + \frac{2E_0 e}{m}\frac{t}{v_0}\right]}$

Answer

$\frac{4\lambda_0}{\left[1 - \frac{E_0 e}{2m}\frac{t}{v_0}\right]}$

Answer

$\frac{4\lambda_0}{\left[1 + \frac{E_0 e}{2m}\frac{t}{v_0}\right]}$

Answer

$\frac{4\lambda_0}{\left[1 + \frac{2E_0 e}{m}\frac{t}{v_0}\right]}$

Answer

$\frac{4\lambda_0}{\left[1 - \frac{2E_0 e}{m}\frac{t}{v_0}\right]}$

JEE Main 5 April 2026, Shift 1, Physics Q35

Same idea in other shifts