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NEET 2018 Physics question

PhysicsDual Nature of Matter and RadiationNEET 2018

An electron of mass with an initial velocity () enters an electric field ( = constant ) at . If is its de-Broglie wavelength initially, then its de-Broglie wavelength at time is

Answer: (3)

Solution

Initial wavelength . Force on the electron (charge ): , i.e. along the initial velocity, so the electron speeds up with . Speed at time : V_0\dfrac{eE_0}{m}V_0(1$ +

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Question ID VK-092206