v=v0i^−mE0etk^∣v∣=v02+ m2E02e2t2λ0=mv0hλ′=mv01+v02 m2E02e2t2hλ′=1+v02 m2E02e2t2λ0
JEE Main 2025 — Physics Modern Physics
An electron of mass ' m ' with an initial velocity v=v0i^(v0>0) enters an electric field E=−Eok^. If the initial de Broglie wavelength is λ0, the value after time t would be
Held on 24 Jan 2025 · Verified 6 Jul 2026.
1+ m2v02e2E02t2λ0
λo1+ m2vo2e2E02t2
1− m2vo2e2Eo2t2λ0
λ0
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
Two $4$ bits binary numbers, $A = 1101$ and $B = 1010$ are given in the inputs of a logic circuit shown in figure below. The output $(Y)$ will be: 
Two radioactive substances A and B of mass numbers $200$ and $212$ respectively, shows spontaneous $\alpha$-decay with same $Q$ value of $1$ MeV. The ratio of energies of $\alpha$-rays produced by A and B is ________.
Using Bohr's model, calculate the ratio of the magnetic fields generated due to the motion of the electrons in the $2^{\text{nd}}$ and $4^{\text{th}}$ orbits of hydrogen atom _______.
The de Broglie wavelength for an electron accelerated through the potential difference of $V_1$ volt is $\lambda_1$. When the potential difference is changed to $V_2$ volt, the associated de Broglie wavelength is increased by $50\%$. If $(V_1/V_2) = (9/\alpha)$, then the value of $\alpha$ is __________.
The output $Y$ for the given inputs $A$ and $B$ to the circuit is: 
Work through every JEE Main Modern Physics PYQ, year by year.