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JEE Main 2026 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2026

An electron of mass m is moving in an electric field (E₀=constant>0), with an initial velocity (v₀=constant>0). If , its de Broglie wavelength at time t is . (e=charge of electron)

Answer: (C)

Solution

Force on electron = (−e)(−2E₀)î = 2eE₀î, so a=2eE₀/m (same direction as v₀).

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Question ID VK-015519